Rename cc::ResourceProvider::ResourceId to cc::ResourceId and move it to its own file.

cc/test/fake_ui_resource_layer_tree_host_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_FAKE_UI_RESOURCE_LAYER_TREE_HOST_IMPL_H_
 #define CC_TEST_FAKE_UI_RESOURCE_LAYER_TREE_HOST_IMPL_H_
 
 #include "base/containers/hash_tables.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 
 namespace cc {
 
 class FakeUIResourceLayerTreeHostImpl : public FakeLayerTreeHostImpl {
  public:
   explicit FakeUIResourceLayerTreeHostImpl(Proxy* proxy,
                                            SharedBitmapManager* manager);
   ~FakeUIResourceLayerTreeHostImpl() override;
 
   void CreateUIResource(UIResourceId uid,
                         const UIResourceBitmap& bitmap) override;
 
   void DeleteUIResource(UIResourceId uid) override;
 
-  ResourceProvider::ResourceId ResourceIdForUIResource(
-      UIResourceId uid) const override;
+  ResourceId ResourceIdForUIResource(UIResourceId uid) const override;
 
   bool IsUIResourceOpaque(UIResourceId uid) const override;
 
  private:
   typedef base::hash_map<UIResourceId, LayerTreeHostImpl::UIResourceData>
       UIResourceMap;
   UIResourceMap fake_ui_resource_map_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_UI_RESOURCE_LAYER_TREE_HOST_IMPL_H_