Fix for 'Simple Adblock' extension crashes

content/public/browser/session_storage_namespace.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_SESSION_STORAGE_NAMESPACE_H_
 #define CONTENT_PUBLIC_BROWSER_SESSION_STORAGE_NAMESPACE_H_
 
+#include <map>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 
 namespace content {
 
 // This is a ref-counted class that represents a SessionStorageNamespace.
 // On destruction it ensures that the storage namespace is destroyed.
@@ skipping 54 matching lines @@
 
   // Indicates whether this SessionStorageNamespace is an alias of |other|,
   // i.e. whether they point to the same underlying data.
   virtual bool IsAliasOf(SessionStorageNamespace* other) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<SessionStorageNamespace>;
   virtual ~SessionStorageNamespace() {}
 };
 
+// Used to store mappings of StoragePartition id to SessionStorageNamespace.
+typedef std::map<std::string, scoped_refptr<SessionStorageNamespace> >
+    SessionStorageNamespaceMap;
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SESSION_STORAGE_NAMESPACE_H_