Fixes for re-enabling more MSVC level 4 warnings: Source/core/ edition

Source/core/events/EventPath.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 164 matching lines @@
 }
 
 TreeScopeEventContext* EventPath::ensureTreeScopeEventContext(Node* currentTarget, TreeScope* treeScope, TreeScopeEventContextMap& treeScopeEventContextMap)
 {
     if (!treeScope)
         return 0;
     TreeScopeEventContext* treeScopeEventContext;
     bool isNewEntry;
     {
         TreeScopeEventContextMap::AddResult addResult = treeScopeEventContextMap.add(treeScope, nullptr);
-        if ((isNewEntry = addResult.isNewEntry))
+        isNewEntry = addResult.isNewEntry;
+        if (isNewEntry)
             addResult.storedValue->value = TreeScopeEventContext::create(*treeScope);
         treeScopeEventContext = addResult.storedValue->value.get();
     }
     if (isNewEntry) {
         TreeScopeEventContext* parentTreeScopeEventContext = ensureTreeScopeEventContext(0, treeScope->olderShadowRootOrParentTreeScope(), treeScopeEventContextMap);
         if (parentTreeScopeEventContext && parentTreeScopeEventContext->target()) {
             treeScopeEventContext->setTarget(parentTreeScopeEventContext->target());
         } else if (currentTarget) {
             treeScopeEventContext->setTarget(eventTargetRespectingTargetRules(currentTarget));
         }
@@ skipping 151 matching lines @@
 
 void EventPath::trace(Visitor* visitor)
 {
     visitor->trace(m_nodeEventContexts);
     visitor->trace(m_node);
     visitor->trace(m_event);
     visitor->trace(m_treeScopeEventContexts);
 }
 
 } // namespace