Revert of Fix gpu command buffer use after free by GrContext

content/common/gpu/client/grcontext_for_webgraphicscontext3d.h

Index: content/common/gpu/client/grcontext_for_webgraphicscontext3d.h
diff --git a/content/common/gpu/client/grcontext_for_webgraphicscontext3d.h b/content/common/gpu/client/grcontext_for_webgraphicscontext3d.h
index 7597f906a584697034a823f99db592000f72fe25..8d0a2ea2a7062b3b5b62050c89c7f68da1977ea0 100644
--- a/content/common/gpu/client/grcontext_for_webgraphicscontext3d.h
+++ b/content/common/gpu/client/grcontext_for_webgraphicscontext3d.h
@@ -6,10 +6,7 @@
 #define CONTENT_COMMON_GPU_CLIENT_GRCONTEXT_FOR_WEBGRAPHICSCONTEXT3D_H_
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/threading/thread_checker.h"
 #include "skia/ext/refptr.h"
-#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
 
 class GrContext;
 
@@ -19,35 +16,13 @@
 
 namespace content {
 
-// Wrap WebGraphicsContext3DImpl into a GrGLInterface object, which allows
-// the WebGraphicsContext3DImpl to be jointly refcounted (indirectly)
-// by the GrContext and the context provider. This makes it legal for the
-// GrContext to be invoked when it outlives the context provider that created
-// it. By doing this we no longer have to worry about use after free errors
-// caused a lack of consideration for object destruction order.
-class GrGLInterfaceForWebGraphicsContext3D final : public GrGLInterface {
- public:
-  GrGLInterfaceForWebGraphicsContext3D(
-      scoped_ptr<gpu_blink::WebGraphicsContext3DImpl> context3d);
-  ~GrGLInterfaceForWebGraphicsContext3D() final;
-
-  void BindToCurrentThread();
-
-  gpu_blink::WebGraphicsContext3DImpl* WebContext3D() const {
-    return context3d_.get();
-  }
- private:
-  base::ThreadChecker context_thread_checker_;
-  scoped_ptr<gpu_blink::WebGraphicsContext3DImpl> context3d_;
-};
-
 // This class binds an offscreen GrContext to an offscreen context3d. The
 // context3d is used by the GrContext so must be valid as long as this class
 // is alive.
 class GrContextForWebGraphicsContext3D {
  public:
   explicit GrContextForWebGraphicsContext3D(
-      skia::RefPtr<GrGLInterfaceForWebGraphicsContext3D> context3d);
+      gpu_blink::WebGraphicsContext3DImpl* context3d);
   virtual ~GrContextForWebGraphicsContext3D();
 
   GrContext* get() { return gr_context_.get(); }