Revert "Fix and enable warning C4244 (Conversion from 'type1' to 'type2', possible loss of data)"

Causing a build failure on Mac/Clang:

./Tokenizer.cpp:551:7: error: extra tokens at end of #else directive [-Werror,-Wextra-tokens]
#else if defined(_MSC_VER)

http://build.chromium.org/p/chromium.gpu.fyi/builders/GPU%20Mac%20Builder/builds/29136

This reverts commit 3b26e231d99154814eb428f75a67bbe7a21adadc.

Change-Id: I2d11ddcc18130d908fd2ec3d6f5ab890cfccd5e7
Reviewed-on: https://chromium-review.googlesource.com/264983
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/Context.cpp b/src/libANGLE/Context.cpp
index 341f7e3..5ea039f 100644
--- a/src/libANGLE/Context.cpp
+++ b/src/libANGLE/Context.cpp
@@ -339,7 +339,7 @@
     // wait commands finish. However, since the name becomes invalid, we cannot query the fence,
     // and since our API is currently designed for being called from a single thread, we can delete
     // the fence immediately.
-    mResourceManager->deleteFenceSync(static_cast<GLuint>(reinterpret_cast<uintptr_t>(fenceSync)));
+    mResourceManager->deleteFenceSync(reinterpret_cast<uintptr_t>(fenceSync));
 }
 
 void Context::deleteVertexArray(GLuint vertexArray)
@@ -445,7 +445,7 @@
 
 FenceSync *Context::getFenceSync(GLsync handle) const
 {
-    return mResourceManager->getFenceSync(static_cast<GLuint>(reinterpret_cast<uintptr_t>(handle)));
+    return mResourceManager->getFenceSync(reinterpret_cast<uintptr_t>(handle));
 }
 
 VertexArray *Context::getVertexArray(GLuint handle) const