DevTools: Do not force style sheets update on inspector start.

Source/core/inspector/InspectorCSSAgent.h

 /*
  * 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 158 matching lines @@
 
     void wasEnabled(PassRefPtr<EnableCallback>);
     void resetNonPersistentData();
     InspectorStyleSheetForInlineStyle* asInspectorStyleSheet(Element* element);
     Element* elementForId(ErrorString*, int nodeId);
     int documentNodeWithRequestedFlowsId(Document*);
     void collectAllStyleSheets(Vector<InspectorStyleSheet*>&);
     void collectAllDocumentStyleSheets(Document*, Vector<CSSStyleSheet*>&);
     void collectStyleSheets(CSSStyleSheet*, Vector<CSSStyleSheet*>&);
 
-    void updateActiveStyleSheets(Document*, const Vector<CSSStyleSheet*>&);
+    void updateActiveStyleSheets(Document*, const Vector<CSSStyleSheet*>&, bool initial);
 
     void collectPlatformFontsForRenderer(RenderText*, HashCountedSet<String>*);
 
     InspectorStyleSheet* bindStyleSheet(CSSStyleSheet*);
     String unbindStyleSheet(InspectorStyleSheet*);
     InspectorStyleSheet* viaInspectorStyleSheet(Document*, bool createIfAbsent);
     InspectorStyleSheet* assertStyleSheetForId(ErrorString*, const String&);
     TypeBuilder::CSS::StyleSheetOrigin::Enum detectOrigin(CSSStyleSheet* pageStyleSheet, Document* ownerDocument);
     bool styleSheetEditInProgress() const { return m_styleSheetsPendingMutation || m_styleDeclarationPendingMutation || m_isSettingStyleSheetText; }
 
@@ skipping 39 matching lines @@
     friend class ChangeRegionOversetTask;
     friend class EnableResourceClient;
     friend class StyleSheetBinder;
     friend class UpdateRegionLayoutTask;
 };
 
 
 } // namespace WebCore
 
 #endif // !defined(InspectorCSSAgent_h)