Remove WinRT ReflectionHelper dead code

Author: h3xds1nz

src/Microsoft.DotNet.Wpf/src/PresentationCore/PresentationCore.csproj

@@ -84,7 +84,6 @@
     <Compile Include="$(WpfSharedDir)\MS\Internal\Ink\BitStream.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Internal\Ink\Native.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Internal\IO\SynchronizingStream.cs" />
-    <Compile Include="$(WpfSharedDir)\MS\Internal\WindowsRuntime\ReflectionHelper.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Win32\SafeSystemMetrics.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Win32\UnsafeNativeMethodsCompiler.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Win32\WinInet.cs" />

src/Microsoft.DotNet.Wpf/src/PresentationFramework/PresentationFramework.csproj

@@ -53,7 +53,6 @@
     <Compile Include="$(WpfSharedDir)\MS\Internal\SafeSecurityHelper.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Internal\SafeSecurityHelperAvalon.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Internal\Text\InternalEncoding.cs" />
-    <Compile Include="$(WpfSharedDir)\MS\Internal\WindowsRuntime\ReflectionHelper.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Internal\Xaml\Context\XamlContextStack.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Internal\Xaml\Context\XamlFrame.cs" />
     <Compile Include="$(WpfSharedDir)\MS\Utility\BindUriHelper.cs" />