Remove WGC3D typedefs and move WebGraphicsInfo to Platform.

gpu/blink/webgraphicscontext3d_impl.h

Index: gpu/blink/webgraphicscontext3d_impl.h
diff --git a/gpu/blink/webgraphicscontext3d_impl.h b/gpu/blink/webgraphicscontext3d_impl.h
index 9c28f89bb2e7568ed32c601a3bbc2b6822e4f12d..76b7c27ccf62763eb12168d59d272b1d8bed5511 100644
--- a/gpu/blink/webgraphicscontext3d_impl.h
+++ b/gpu/blink/webgraphicscontext3d_impl.h
@@ -74,9 +74,6 @@ class GPU_BLINK_EXPORT WebGraphicsContext3DImpl
   scoped_ptr<WebGraphicsContext3DErrorMessageCallback>
       client_error_message_callback_;
 
-  // Errors raised by synthesizeGLError().
-  std::vector<blink::WGC3Denum> synthetic_errors_;
-
   ::gpu::gles2::GLES2Interface* gl_;
   bool lose_context_when_out_of_memory_;
 };