DevTools: use per-LocalFrame instrumenting agents instead of per-Page ones.

Source/core/inspector/InspectorResourceAgent.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 905 matching lines @@
     }
 }
 
 void InspectorResourceAgent::emulateNetworkConditions(ErrorString*, bool, double, double, double)
 {
 }
 
 void InspectorResourceAgent::loadResourceForFrontend(ErrorString* errorString, const String& url, const RefPtr<JSONObject>* requestHeaders, PassRefPtrWillBeRawPtr<LoadResourceForFrontendCallback> prpCallback)
 {
     RefPtrWillBeRawPtr<LoadResourceForFrontendCallback> callback = prpCallback;
-    Frame* frame = m_pageAgent->page()->mainFrame();
+    Frame* frame = m_pageAgent->mainFrame();
     if (!frame || !frame->isLocalFrame()) {
         *errorString = "No frame to use as a loader found";
         return;
     }
 
     Document* document = static_cast<LocalFrame*>(frame)->document();
     if (!document) {
         *errorString = "No Document instance found";
         return;
     }
@@ skipping 95 matching lines @@
     , m_removeFinishedReplayXHRTimer(this, &InspectorResourceAgent::removeFinishedReplayXHRFired)
 {
 }
 
 bool InspectorResourceAgent::shouldForceCORSPreflight()
 {
     return m_state->getBoolean(ResourceAgentState::cacheDisabled);
 }
 
 } // namespace blink