Inside of content, prefer SiteInstanceImpl to SiteInstance.

content/test/test_render_frame_host_factory.cc

 // 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.
 
 #include "content/test/test_render_frame_host_factory.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "content/test/test_render_frame_host.h"
 
 namespace content {
 
 TestRenderFrameHostFactory::TestRenderFrameHostFactory() {
   RenderFrameHostFactory::RegisterFactory(this);
 }
 
 TestRenderFrameHostFactory::~TestRenderFrameHostFactory() {
   RenderFrameHostFactory::UnregisterFactory();
 }
 
 scoped_ptr<RenderFrameHostImpl>
 TestRenderFrameHostFactory::CreateRenderFrameHost(
-    SiteInstance* site_instance,
+    SiteInstanceImpl* site_instance,
     RenderViewHostImpl* render_view_host,
     RenderFrameHostDelegate* delegate,
     RenderWidgetHostDelegate* rwh_delegate,
     FrameTree* frame_tree,
     FrameTreeNode* frame_tree_node,
     int32_t routing_id,
     int32_t widget_routing_id,
     bool hidden) {
   return make_scoped_ptr(new TestRenderFrameHost(
       site_instance, render_view_host, delegate, rwh_delegate, frame_tree,
       frame_tree_node, routing_id, widget_routing_id, hidden));
 }
 
 }  // namespace content