Change Page::m_mainFrame to be a Frame.

Source/core/loader/PingLoader.cpp

 /*
  * Copyright (C) 2010 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 140 matching lines @@
 {
     if (m_loader)
         m_loader->cancel();
 }
 
 void PingLoader::didReceiveResponse(blink::WebURLLoader*, const blink::WebURLResponse&)
 {
     if (Page* page = this->page()) {
         TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "ResourceFinish", "data", InspectorResourceFinishEvent::data(m_identifier, 0, true));
         // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
-        InspectorInstrumentation::didFailLoading(page->mainFrame(), m_identifier, ResourceError::cancelledError(m_url));
+        InspectorInstrumentation::didFailLoading(toLocalFrame(page->mainFrame()), m_identifier, ResourceError::cancelledError(m_url));
     }
     delete this;
 }
 
 void PingLoader::didReceiveData(blink::WebURLLoader*, const char*, int, int)
 {
     if (Page* page = this->page()) {
         TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "ResourceFinish", "data", InspectorResourceFinishEvent::data(m_identifier, 0, true));
         // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
-        InspectorInstrumentation::didFailLoading(page->mainFrame(), m_identifier, ResourceError::cancelledError(m_url));
+        InspectorInstrumentation::didFailLoading(toLocalFrame(page->mainFrame()), m_identifier, ResourceError::cancelledError(m_url));
     }
     delete this;
 }
 
 void PingLoader::didFinishLoading(blink::WebURLLoader*, double, int64_t)
 {
     if (Page* page = this->page()) {
         TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "ResourceFinish", "data", InspectorResourceFinishEvent::data(m_identifier, 0, true));
         // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
-        InspectorInstrumentation::didFailLoading(page->mainFrame(), m_identifier, ResourceError::cancelledError(m_url));
+        InspectorInstrumentation::didFailLoading(toLocalFrame(page->mainFrame()), m_identifier, ResourceError::cancelledError(m_url));
     }
     delete this;
 }
 
 void PingLoader::didFail(blink::WebURLLoader*, const blink::WebURLError& resourceError)
 {
     if (Page* page = this->page()) {
         TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "ResourceFinish", "data", InspectorResourceFinishEvent::data(m_identifier, 0, true));
         // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
-        InspectorInstrumentation::didFailLoading(page->mainFrame(), m_identifier, ResourceError(resourceError));
+        InspectorInstrumentation::didFailLoading(toLocalFrame(page->mainFrame()), m_identifier, ResourceError(resourceError));
     }
     delete this;
 }
 
 void PingLoader::timeout(Timer<PingLoader>*)
 {
     if (Page* page = this->page()) {
         TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "ResourceFinish", "data", InspectorResourceFinishEvent::data(m_identifier, 0, true));
         // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
-        InspectorInstrumentation::didFailLoading(page->mainFrame(), m_identifier, ResourceError::cancelledError(m_url));
+        InspectorInstrumentation::didFailLoading(toLocalFrame(page->mainFrame()), m_identifier, ResourceError::cancelledError(m_url));
     }
     delete this;
 }
 
 }