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 112 matching lines @@
         algorithmValue.addString("name", WebCryptoAlgorithm::lookupAlgorithmInfo(algorithm.id())->name);
         m_builder.add(propertyName, algorithmValue);
     }
 
     virtual void setUint8Array(const char* propertyName, const WebVector<unsigned char>& vector)
     {
         m_builder.add(propertyName, DOMUint8Array::create(vector.data(), vector.size()));
     }
 
 private:
+    // Oilpan: CSSParserObserver is stack allocated and stack scanning will
+    // separately locate it.
+    GC_PLUGIN_IGNORE("509911")
     V8ObjectBuilder& m_builder;
 };
 
 } // namespace
 
 CryptoKey::~CryptoKey()
 {
 }
 
 CryptoKey::CryptoKey(const WebCryptoKey& key)
@@ skipping 81 matching lines @@
         if (!usage) {
             result->completeWithError(WebCryptoErrorTypeType, "Invalid keyUsages argument");
             return false;
         }
         mask |= usage;
     }
     return true;
 }
 
 } // namespace blink