Revert of Extract WebGraphicsContext3DImpl from webkit/common/gpu.

webkit/common/gpu/grcontext_for_webgraphicscontext3d.h

Index: webkit/common/gpu/grcontext_for_webgraphicscontext3d.h
diff --git a/webkit/common/gpu/grcontext_for_webgraphicscontext3d.h b/webkit/common/gpu/grcontext_for_webgraphicscontext3d.h
index 0d882e8a89ee364625d41f583a559471fd21e9dc..5ea712b3e8dbabc6ebf6eba6e4d9a292bcba965e 100644
--- a/webkit/common/gpu/grcontext_for_webgraphicscontext3d.h
+++ b/webkit/common/gpu/grcontext_for_webgraphicscontext3d.h
@@ -11,12 +11,9 @@
 
 class GrContext;
 
-namespace gpu_blink {
-class WebGraphicsContext3DImpl;
-}
-
 namespace webkit {
 namespace gpu {
+class WebGraphicsContext3DImpl;
 
 // 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
@@ -24,7 +21,7 @@
 class WEBKIT_GPU_EXPORT GrContextForWebGraphicsContext3D {
  public:
   explicit GrContextForWebGraphicsContext3D(
-      gpu_blink::WebGraphicsContext3DImpl* context3d);
+      WebGraphicsContext3DImpl* context3d);
   virtual ~GrContextForWebGraphicsContext3D();
 
   GrContext* get() { return gr_context_.get(); }