Oilpan: have HTMLImport::recalcTreeState() use on-heap local variables.

Source/core/html/imports/HTMLImport.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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 69 matching lines @@
 void HTMLImport::stateDidChange()
 {
     if (!state().shouldBlockScriptExecution()) {
         if (Document* document = this->document())
             document->didLoadAllImports();
     }
 }
 
 void HTMLImport::recalcTreeState(HTMLImport* root)
 {
-    HashMap<HTMLImport*, HTMLImportState> snapshot;
-    Vector<HTMLImport*> updated;
+    WillBeHeapHashMap<RawPtrWillBeMember<HTMLImport>, HTMLImportState> snapshot;
+    WillBeHeapVector<RawPtrWillBeMember<HTMLImport> > updated;
 
     for (HTMLImport* i = root; i; i = traverseNext(i)) {
         snapshot.add(i, i->state());
         i->m_state = HTMLImportState::invalidState();
     }
 
     // The post-visit DFS order matters here because
     // HTMLImportStateResolver in recalcState() Depends on
     // |m_state| of its children and precedents of ancestors.
     // Accidental cycle dependency of state computation is prevented
@@ skipping 32 matching lines @@
         child->showTree(highlight, depth + 1);
 }
 
 void HTMLImport::showThis()
 {
     fprintf(stderr, "%p state=%d", this, m_state.peekValueForDebug());
 }
 #endif
 
 } // namespace WebCore