Don't call RenderView directly if USE_THREADED_COMPOSITOR is set.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #define CONTENT_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
@@ skipping 422 matching lines @@
  private:
   // SwapBuffers callback.
   void OnSwapBuffersComplete();
   virtual void OnContextLost(RendererGLContext::ContextLostReason reason);
 
   // The context we use for OpenGL rendering.
   RendererGLContext* context_;
   // 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_;
 #endif
   WebGraphicsContext3D::WebGraphicsContextLostCallback* context_lost_callback_;
   WGC3Denum context_lost_reason_;
 
   WebGraphicsContext3D::WebGraphicsSwapBuffersCompleteCallbackCHROMIUM*
       swapbuffers_complete_callback_;
 
   WebKit::WebGraphicsContext3D::Attributes attributes_;
   int cached_width_, cached_height_;
 
   // For tracking which FBO is bound.
   WebGLId bound_fbo_;
 
   // Errors raised by synthesizeGLError().
   std::vector<WGC3Denum> synthetic_errors_;
 
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
   scoped_array<uint8> scanline_;
   void FlipVertically(uint8* framebuffer,
                       unsigned int width,
                       unsigned int height);
 #endif
 };
 
 #endif  // defined(ENABLE_GPU)
 #endif  // CONTENT_RENDERER_GPU_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_