Fix for 'Simple Adblock' extension crashes

content/public/browser/session_storage_namespace.h

Index: content/public/browser/session_storage_namespace.h
diff --git a/content/public/browser/session_storage_namespace.h b/content/public/browser/session_storage_namespace.h
index ec49419ffb353d6503e100766d47701e04c87165..374b7b050fb8666437befe0145b09948a5fd32da 100644
--- a/content/public/browser/session_storage_namespace.h
+++ b/content/public/browser/session_storage_namespace.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_PUBLIC_BROWSER_SESSION_STORAGE_NAMESPACE_H_
 #define CONTENT_PUBLIC_BROWSER_SESSION_STORAGE_NAMESPACE_H_
 
+#include <map>
 #include <string>
 
 #include "base/basictypes.h"
@@ -79,6 +80,10 @@ class 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_