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

third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
index 2055922e69fef46c0252e145e64722272a0cba48..7a48e0e7b9b1374597cf0ef1dc5107cabf0bcd55 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
@@ -638,7 +638,7 @@ 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);
 }