Revert 118789 - Always use webkit compositor

ui/gfx/compositor/compositor_cc.cc

Index: ui/gfx/compositor/compositor_cc.cc
===================================================================
--- ui/gfx/compositor/compositor_cc.cc	(revision 118791)
+++ ui/gfx/compositor/compositor_cc.cc	(working copy)
@@ -264,19 +264,10 @@
     // Use context that results in no rendering to the screen.
     context = new TestWebGraphicsContext3D();
   } else {
-#if defined(OS_MACOSX) && !defined(USE_AURA)
-    // Non-Aura builds compile this code but doesn't call it. Unfortunately
-    // this is where we translate gfx::AcceleratedWidget to
-    // gfx::PluginWindowHandle, and they are different on non-Aura Mac.
-    // TODO(piman): remove ifdefs when AcceleratedWidget is rationalized on Mac.
-    NOTIMPLEMENTED();
-    return NULL;
-#else
     gfx::GLShareGroup* share_group =
         SharedResourcesCC::GetInstance()->GetShareGroup();
     context = new webkit::gpu::WebGraphicsContext3DInProcessImpl(
         widget_, share_group);
-#endif
   }
   WebKit::WebGraphicsContext3D::Attributes attrs;
   context->initialize(attrs, 0, true);