DevTools: reduce ResourceAgent dependency on PageAgent.

Source/core/inspector/InspectorStyleSheet.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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 1535 matching lines @@
 }
 
 bool InspectorStyleSheet::resourceStyleSheetText(String* result) const
 {
     if (m_origin == TypeBuilder::CSS::StyleSheetOrigin::User || m_origin == TypeBuilder::CSS::StyleSheetOrigin::User_agent)
         return false;
 
     if (!ownerDocument())
         return false;
 
+    KURL url(ParsedURLString, m_pageStyleSheet->href());
+    if (m_pageAgent->getEditedResourceContent(url, result))
+        return true;
+
     bool base64Encoded;
-    bool success = m_resourceAgent->fetchResourceContent(ownerDocument(), KURL(ParsedURLString, m_pageStyleSheet->href()), result, &base64Encoded) && !base64Encoded;
-    return success;
+    bool success = m_resourceAgent->fetchResourceContent(ownerDocument(), url, result, &base64Encoded);
+    return success && !base64Encoded;
 }
 
 Element* InspectorStyleSheet::ownerStyleElement() const
 {
     Node* ownerNode = m_pageStyleSheet->ownerNode();
     if (!ownerNode || !ownerNode->isElementNode())
         return 0;
     Element* ownerElement = toElement(ownerNode);
 
     if (!isHTMLStyleElement(ownerElement) && !isSVGStyleElement(ownerElement))
@@ skipping 142 matching lines @@
 void InspectorStyleSheetForInlineStyle::trace(Visitor* visitor)
 {
     visitor->trace(m_element);
     visitor->trace(m_ruleSourceData);
     visitor->trace(m_inspectorStyle);
     InspectorStyleSheetBase::trace(visitor);
 }
 
 } // namespace blink