Remove C::swap(C*) where C = Hash{Map,Set}<T>.

third_party/WebKit/Source/core/inspector/InspectorCSSAgent.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 620 matching lines @@
 {
     if (m_state->booleanProperty(CSSAgentState::cssAgentEnabled, false))
         wasEnabled();
 }
 
 void InspectorCSSAgent::flushPendingProtocolNotifications()
 {
     if (!m_invalidatedDocuments.size())
         return;
     HeapHashSet<Member<Document>> invalidatedDocuments;
-    m_invalidatedDocuments.swap(&invalidatedDocuments);
+    m_invalidatedDocuments.swap(invalidatedDocuments);
     for (Document* document: invalidatedDocuments)
         updateActiveStyleSheets(document, ExistingFrontendRefresh);
 }
 
 void InspectorCSSAgent::reset()
 {
     m_idToInspectorStyleSheet.clear();
     m_idToInspectorStyleSheetForInlineStyle.clear();
     m_cssStyleSheetToInspectorStyleSheet.clear();
     m_documentToCSSStyleSheets.clear();
@@ skipping 1422 matching lines @@
     visitor->trace(m_cssStyleSheetToInspectorStyleSheet);
     visitor->trace(m_documentToCSSStyleSheets);
     visitor->trace(m_invalidatedDocuments);
     visitor->trace(m_nodeToInspectorStyleSheet);
     visitor->trace(m_documentToViaInspectorStyleSheet);
     visitor->trace(m_inspectorUserAgentStyleSheet);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink