Remove several calls to Page::mainFrame

Source/core/inspector/InspectorDatabaseAgent.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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 190 matching lines @@
 
     RefPtr<InspectorDatabaseResource> resource = InspectorDatabaseResource::create(database, domain, name, version);
     m_resources.set(resource->id(), resource);
     // Resources are only bound while visible.
     if (m_frontend && m_enabled)
         resource->bind(m_frontend);
 }
 
 void InspectorDatabaseAgent::didCommitLoad(Frame* frame, DocumentLoader* loader)
 {
+    // FIXME: If "frame" is always guarenteed to be in the same Page as loader->frame()
+    // then all we need to check here is loader->frame()->isMainFrame()
+    // and we don't need "frame" at all.
     if (loader->frame() != frame->page()->mainFrame())
         return;
 
     m_resources.clear();
 }
 
 InspectorDatabaseAgent::InspectorDatabaseAgent(InstrumentingAgents* instrumentingAgents, InspectorCompositeState* state)
     : InspectorBaseAgent<InspectorDatabaseAgent>("Database", instrumentingAgents, state)
     , m_frontend(0)
     , m_enabled(false)
@@ skipping 101 matching lines @@
 
 Database* InspectorDatabaseAgent::databaseForId(const String& databaseId)
 {
     DatabaseResourcesMap::iterator it = m_resources.find(databaseId);
     if (it == m_resources.end())
         return 0;
     return it->value->database();
 }
 
 } // namespace WebCore