Fetch a new GAIA picture every time chrome://settings/manageProfile comes up.

chrome/browser/ui/webui/options/manage_profile_handler.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 CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGE_PROFILE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGE_PROFILE_HANDLER_H_
 
 #include <string>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 104 matching lines @@
   // Callback for the "addProfileShortcut" message, which is called when editing
   // an existing profile and the user clicks the "Add desktop shortcut" button.
   // Adds a desktop shortcut for the profile.
   void AddProfileShortcut(const base::ListValue* args);
 
   // Callback for the "removeProfileShortcut" message, which is called when
   // editing an existing profile and the user clicks the "Remove desktop
   // shortcut" button. Removes the desktop shortcut for the profile.
   void RemoveProfileShortcut(const base::ListValue* args);
 
+  // Callback for the "refreshGAIAPicture" message, which is called when the
+  // user pressed "Edit" for an existing profile.
+  void RefreshGaiaPicture(const base::ListValue* args);
+
   // URL for the current profile's GAIA picture.
   std::string gaia_picture_url_;
 
   // Used to observe the preference that allows creating managed users, which
   // can be changed by policy.
   PrefChangeRegistrar pref_change_registrar_;
 
   // For generating weak pointers to itself for callbacks.
   base::WeakPtrFactory<ManageProfileHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ManageProfileHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_MANAGE_PROFILE_HANDLER_H_