Remove offscreen compositor contexts.

cc/test/fake_layer_tree_host_client.h

Index: cc/test/fake_layer_tree_host_client.h
diff --git a/cc/test/fake_layer_tree_host_client.h b/cc/test/fake_layer_tree_host_client.h
index 65ca01923913ae0eb22a626022592907a9030841..1b0ec1f4f830a23a0cb388df26f73fc42a30a627 100644
--- a/cc/test/fake_layer_tree_host_client.h
+++ b/cc/test/fake_layer_tree_host_client.h
@@ -40,7 +40,6 @@ class FakeLayerTreeHostClient : public LayerTreeHostClient,
   virtual void DidCommit() OVERRIDE {}
   virtual void DidCommitAndDrawFrame() OVERRIDE {}
   virtual void DidCompleteSwapBuffers() OVERRIDE {}
-  virtual scoped_refptr<ContextProvider> OffscreenContextProvider() OVERRIDE;
 
   // LayerTreeHostSingleThreadClient implementation.
   virtual void ScheduleComposite() OVERRIDE {}
@@ -51,8 +50,6 @@ class FakeLayerTreeHostClient : public LayerTreeHostClient,
  private:
   bool use_software_rendering_;
   bool use_delegating_renderer_;
-
-  scoped_refptr<TestContextProvider> offscreen_contexts_;
 };
 
 }  // namespace cc