Don't call RenderView directly if USE_THREADED_COMPOSITOR is set.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h

Index: content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
===================================================================
--- content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h	(revision 97492)
+++ content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h	(working copy)
@@ -440,8 +440,11 @@
   // The GLES2Implementation we use for OpenGL rendering.
   gpu::gles2::GLES2Implementation* gl_;
 
+  bool render_directly_to_web_view_;
+#ifndef WTF_USE_THREADED_COMPOSITING
   // If rendering directly to WebView, weak pointer to it.
   WebKit::WebView* web_view_;
+#endif
 #if defined(OS_MACOSX)
   // "Fake" plugin window handle in browser process for the compositor's output.
   gfx::PluginWindowHandle plugin_handle_;