Fix a crash in PageActionImageView when extensions are reloaded due to incognito settings changing.

chrome/test/base/testing_profile.h

Index: chrome/test/base/testing_profile.h
===================================================================
--- chrome/test/base/testing_profile.h	(revision 108847)
+++ chrome/test/base/testing_profile.h	(working copy)
@@ -131,6 +131,10 @@
   // NULL.
   void CreateTemplateURLService();
 
+  // Creates an ExtensionProcessManager. If not invoked, the
+  // ExtensionProcessManager is NULL.
+  void CreateExtensionProcessManager();
+
   // Creates an ExtensionService initialized with the testing profile and
   // returns it. The profile keeps its own copy of a scoped_refptr to the
   // ExtensionService to make sure that is still alive to be notified when the
@@ -377,6 +381,8 @@
 
   scoped_ptr<ExtensionService> extension_service_;
 
+  scoped_ptr<ExtensionProcessManager> extension_process_manager_;
+
   scoped_ptr<ExtensionPrefValueMap> extension_pref_value_map_;
 
   scoped_refptr<ExtensionSpecialStoragePolicy>