Cleanup: Remove some deprecated ExtensionService usage.

chrome/browser/extensions/extension_service.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_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 240 matching lines @@
 
   // Initialize and start all installed extensions.
   void Init();
 
   // Called when the associated Profile is going to be destroyed.
   void Shutdown();
 
   // Reloads the specified extension, sending the onLaunched() event to it if it
   // currently has any window showing.
   // Allows noisy failures.
+  // NOTE: Reloading an extension can invalidate |extension_id| and Extension
+  // pointers for the given extension. Consider making a copy of |extension_id|
+  // first and retrieving a new Extension pointer afterwards.
   void ReloadExtension(const std::string& extension_id);
 
   // Suppresses noisy failures.
   void ReloadExtensionWithQuietFailure(const std::string& extension_id);
 
   // Uninstalls the specified extension. Callers should only call this method
   // with extensions that exist. |reason| lets the caller specify why the
   // extension is uninstalled.
   //
   // If the return value is true, |deletion_done_callback| is invoked when data
@@ skipping 456 matching lines @@
                            GreylistedExtensionDisabled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            GreylistDontEnableManuallyDisabled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            GreylistUnknownDontChange);
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_