Oilpan: tidy up some inter-stack object references.

Source/modules/crypto/CryptoKey.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 81 matching lines @@
 WebCryptoKeyUsageMask keyUsageStringToMask(const String& usageString)
 {
     for (size_t i = 0; i < WTF_ARRAY_LENGTH(keyUsageMappings); ++i) {
         if (keyUsageMappings[i].name == usageString)
             return keyUsageMappings[i].value;
     }
     return 0;
 }
 
 class DictionaryBuilder : public WebCryptoKeyAlgorithmDictionary {
+    STACK_ALLOCATED();
 public:
     explicit DictionaryBuilder(V8ObjectBuilder& builder)
         : m_builder(builder)
     {
     }
 
     virtual void setString(const char* propertyName, const char* value)
     {
         m_builder.addString(propertyName, value);
     }
@@ skipping 112 matching lines @@
         if (!usage) {
             result->completeWithError(WebCryptoErrorTypeType, "Invalid keyUsages argument");
             return false;
         }
         mask |= usage;
     }
     return true;
 }
 
 } // namespace blink