Oilpan: insist on HTMLImportStateResolver stack allocation.

Source/core/html/imports/HTMLImportStateResolver.h

 /*
  * Copyright (C) 2014 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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLImportStateResolver_h
 #define HTMLImportStateResolver_h
 
 #include "core/html/imports/HTMLImportState.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
 class HTMLImport;
 
 class HTMLImportStateResolver {
+    STACK_ALLOCATED();
 public:
     explicit HTMLImportStateResolver(HTMLImport* import)
         : m_import(import)
-    { }
+    {
+    }
 
     HTMLImportState resolve() const;
 
 private:
     static bool isBlockingFollowers(HTMLImport*);
 
     bool shouldBlockScriptExecution() const;
     bool isActive() const;
 
-    HTMLImport* m_import;
+    RawPtrWillBeMember<HTMLImport> m_import;
 };
 
 }
 
 #endif // HTMLImportStateResolver_h