Stop using the WebView::sharedGraphicsContext3D interface.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 85cc17f6923e4cdeca090465f4cdcf5dfceffa1b..d9cdee096cd589fba056982b65b18923a9294d8d 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -924,7 +924,7 @@ RenderThreadImpl::CreateOffscreenContext3d() {
 }
 
 class RenderThreadImpl::RendererContextProviderCommandBuffer
-    : public content::ContextProviderCommandBuffer {
+    : public ContextProviderCommandBuffer {
  protected:
   virtual ~RendererContextProviderCommandBuffer() {}
 
@@ -936,7 +936,7 @@ class RenderThreadImpl::RendererContextProviderCommandBuffer
   }
 };
 
-scoped_refptr<cc::ContextProvider>
+scoped_refptr<ContextProviderCommandBuffer>
 RenderThreadImpl::OffscreenContextProviderForMainThread() {
   if (!shared_contexts_main_thread_ ||
       shared_contexts_main_thread_->DestroyedOnMainThread())
@@ -944,7 +944,7 @@ RenderThreadImpl::OffscreenContextProviderForMainThread() {
   return shared_contexts_main_thread_;
 }
 
-scoped_refptr<cc::ContextProvider>
+scoped_refptr<ContextProviderCommandBuffer>
 RenderThreadImpl::OffscreenContextProviderForCompositorThread() {
   if (!shared_contexts_compositor_thread_ ||
       shared_contexts_compositor_thread_->DestroyedOnMainThread()) {