One instead of three resolverChanged replacing source in inspector.

third_party/WebKit/Source/core/css/CSSStyleSheet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 395 matching lines @@
     while (root->parentStyleSheet())
         root = root->parentStyleSheet();
     return root->ownerNode() ? &root->ownerNode()->document() : nullptr;
 }
 
 void CSSStyleSheet::setAllowRuleAccessFromOrigin(PassRefPtr<SecurityOrigin> allowedOrigin)
 {
     m_allowRuleAccessFromOrigin = allowedOrigin;
 }
 
-void CSSStyleSheet::clearChildRuleCSSOMWrappers()
-{
-    m_childRuleCSSOMWrappers.clear();
-}
-
 bool CSSStyleSheet::sheetLoaded()
 {
     ASSERT(m_ownerNode);
     setLoadCompleted(m_ownerNode->sheetLoaded());
     return m_loadCompleted;
 }
 
 void CSSStyleSheet::startLoadingDynamicSheet()
 {
     setLoadCompleted(false);
     m_ownerNode->startLoadingDynamicSheet();
 }
 
 void CSSStyleSheet::setLoadCompleted(bool completed)
 {
     if (completed == m_loadCompleted)
         return;
 
     m_loadCompleted = completed;
 
     if (completed)
         m_contents->clientLoadCompleted(this);
     else
         m_contents->clientLoadStarted(this);
 }
 
+void CSSStyleSheet::setText(const String& text)
+{
+    m_childRuleCSSOMWrappers.clear();
+
+    CSSStyleSheet::RuleMutationScope mutationScope(this);
+    m_contents->clearRules();
+    m_contents->parseString(text);
+}
+
 DEFINE_TRACE(CSSStyleSheet)
 {
     visitor->trace(m_contents);
     visitor->trace(m_mediaQueries);
     visitor->trace(m_ownerNode);
     visitor->trace(m_ownerRule);
     visitor->trace(m_mediaCSSOMWrapper);
     visitor->trace(m_childRuleCSSOMWrappers);
     visitor->trace(m_ruleListCSSOMWrapper);
     StyleSheet::trace(visitor);
 }
 
 } // namespace blink