Use FrameTreeNode ID as frameId in extension APIs

chrome/browser/extensions/api/web_navigation/web_navigation_api.cc

 // Copyright (c) 2012 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.
 
 // Implements the Chrome Extensions WebNavigation API.
 
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api.h"
 
 #include "base/lazy_instance.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 470 matching lines @@
   replacements.ClearRef();
   return existing_url.ReplaceComponents(replacements) ==
       url.ReplaceComponents(replacements);
 }
 
 bool WebNavigationGetFrameFunction::RunSync() {
   scoped_ptr<GetFrame::Params> params(GetFrame::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
   int tab_id = params->details.tab_id;
   int frame_id = params->details.frame_id;
-  int process_id = params->details.process_id;
 
   SetResult(base::Value::CreateNullValue());
 
   content::WebContents* web_contents;
   if (!ExtensionTabUtil::GetTabById(tab_id,
                                     GetProfile(),
                                     include_incognito(),
                                     NULL,
                                     NULL,
                                     &web_contents,
                                     NULL) ||
       !web_contents) {
     return true;
   }
 
   WebNavigationTabObserver* observer =
       WebNavigationTabObserver::Get(web_contents);
   DCHECK(observer);
 
   const FrameNavigationState& frame_navigation_state =
       observer->frame_navigation_state();
 
   content::RenderFrameHost* render_frame_host =
       frame_id == 0 ? web_contents->GetMainFrame()
-                    : content::RenderFrameHost::FromID(process_id, frame_id);
+                    : web_contents->FindFrameByFrameTreeNodeID(frame_id);
   if (!frame_navigation_state.IsValidFrame(render_frame_host))
     return true;
 
   GURL frame_url = frame_navigation_state.GetUrl(render_frame_host);
   if (!frame_navigation_state.IsValidUrl(frame_url))
     return true;
 
   GetFrame::Results::Details frame_details;
   frame_details.url = frame_url.spec();
   frame_details.error_occurred =
@@ skipping 86 matching lines @@
   return g_factory.Pointer();
 }
 
 void WebNavigationAPI::OnListenerAdded(const EventListenerInfo& details) {
   web_navigation_event_router_.reset(new WebNavigationEventRouter(
       Profile::FromBrowserContext(browser_context_)));
   EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 }  // namespace extensions