Remove C# dynamic support from JsonNode (#55430)

Author: steveharter

src/libraries/System.Text.Json/ref/System.Text.Json.cs

@@ -547,7 +547,7 @@ public void RemoveAt(int index) { }
         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { throw null; }
         public override void WriteTo(System.Text.Json.Utf8JsonWriter writer, System.Text.Json.JsonSerializerOptions? options = null) { }
     }
-    public abstract partial class JsonNode : System.Dynamic.IDynamicMetaObjectProvider
+    public abstract partial class JsonNode
     {
         internal JsonNode() { }
         public System.Text.Json.Nodes.JsonNode? this[int index] { get { throw null; } set { } }
@@ -646,7 +646,6 @@ internal JsonNode() { }
         public static System.Text.Json.Nodes.JsonNode? Parse(System.ReadOnlySpan<byte> utf8Json, System.Text.Json.Nodes.JsonNodeOptions? nodeOptions = default(System.Text.Json.Nodes.JsonNodeOptions?), System.Text.Json.JsonDocumentOptions documentOptions = default(System.Text.Json.JsonDocumentOptions)) { throw null; }
         public static System.Text.Json.Nodes.JsonNode? Parse(string json, System.Text.Json.Nodes.JsonNodeOptions? nodeOptions = default(System.Text.Json.Nodes.JsonNodeOptions?), System.Text.Json.JsonDocumentOptions documentOptions = default(System.Text.Json.JsonDocumentOptions)) { throw null; }
         public static System.Text.Json.Nodes.JsonNode? Parse(ref System.Text.Json.Utf8JsonReader reader, System.Text.Json.Nodes.JsonNodeOptions? nodeOptions = default(System.Text.Json.Nodes.JsonNodeOptions?)) { throw null; }
-        System.Dynamic.DynamicMetaObject System.Dynamic.IDynamicMetaObjectProvider.GetMetaObject(System.Linq.Expressions.Expression parameter) { throw null; }
         public string ToJsonString(System.Text.Json.JsonSerializerOptions? options = null) { throw null; }
         public override string ToString() { throw null; }
         public abstract void WriteTo(System.Text.Json.Utf8JsonWriter writer, System.Text.Json.JsonSerializerOptions? options = null);

src/libraries/System.Text.Json/ref/System.Text.Json.csproj

@@ -13,15 +13,13 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)'">
-    <ProjectReference Include="$(LibrariesProjectRoot)System.Linq.Expressions\ref\System.Linq.Expressions.csproj" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Memory\ref\System.Memory.csproj" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\ref\System.Runtime.csproj" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
     <Reference Include="System.Collections" />
     <Reference Include="System.Memory" />
     <Reference Include="System.Runtime" />
-    <Reference Include="System.Linq.Expressions" />
     <Reference Include="netstandard" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">

src/libraries/System.Text.Json/src/ILLink/ILLink.Suppressions.LibraryBuild.xml

@@ -59,20 +59,17 @@
     <Compile Include="System\Text\Json\Nodes\JsonArray.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonArray.IList.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonNode.cs" />
-    <Compile Include="System\Text\Json\Nodes\JsonNode.Dynamic.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonNode.Operators.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonNode.Parse.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonNode.To.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonNodeOptions.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonObject.cs" />
-    <Compile Include="System\Text\Json\Nodes\JsonObject.Dynamic.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonObject.IDictionary.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonValue.CreateOverloads.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonValue.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonValueNotTrimmable.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonValueOfT.cs" />
     <Compile Include="System\Text\Json\Nodes\JsonValueTrimmable.cs" />
-    <Compile Include="System\Text\Json\Nodes\MetaDynamic.cs" />
     <Compile Include="System\Text\Json\Reader\ConsumeNumberResult.cs" />
     <Compile Include="System\Text\Json\Reader\ConsumeTokenResult.cs" />
     <Compile Include="System\Text\Json\Reader\JsonReaderException.cs" />
@@ -298,7 +295,6 @@
     <Reference Include="System.Collections.Concurrent" />
     <Reference Include="System.Diagnostics.Debug" />
     <Reference Include="System.Diagnostics.Tools" Condition="'$(TargetFramework)' == 'netcoreapp3.1'" />
-    <Reference Include="System.Linq.Expressions" />
     <Reference Include="System.Memory" />
     <Reference Include="System.Numerics.Vectors" />
     <Reference Include="System.Reflection.Emit.ILGeneration" />
@@ -315,7 +311,6 @@
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
     <PackageReference Include="System.Buffers" Version="$(SystemBuffersVersion)" />
-    <PackageReference Include="System.Linq.Expressions" Version="$(SystemLinqExpressionsVersion)" />
     <PackageReference Include="System.Memory" Version="$(SystemMemoryVersion)" />
     <PackageReference Include="System.Numerics.Vectors" Version="$(SystemNumericsVectorsVersion)" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="$(SystemThreadingTasksExtensionsVersion)" />