Fix some extern usage in .cc files.

chrome/browser/ui/ash/chrome_launcher_prefs.cc

 // 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.
 
 #include "chrome/browser/ui/ash/chrome_launcher_prefs.h"
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension_constants.h"
@@ skipping 20 matching lines @@
 
 }  // namespace
 
 namespace ash {
 
 const char kPinnedAppsPrefAppIDPath[] = "id";
 
 const char kShelfAutoHideBehaviorAlways[] = "Always";
 const char kShelfAutoHideBehaviorNever[] = "Never";
 
-extern const char kShelfAlignmentBottom[] = "Bottom";
-extern const char kShelfAlignmentLeft[] = "Left";
-extern const char kShelfAlignmentRight[] = "Right";
-extern const char kShelfAlignmentTop[] = "Top";
+const char kShelfAlignmentBottom[] = "Bottom";
+const char kShelfAlignmentLeft[] = "Left";
+const char kShelfAlignmentRight[] = "Right";
+const char kShelfAlignmentTop[] = "Top";
 
 void RegisterChromeLauncherUserPrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   // TODO: If we want to support multiple profiles this will likely need to be
   // pushed to local state and we'll need to track profile per item.
   registry->RegisterIntegerPref(
       prefs::kShelfChromeIconIndex,
       0,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
   registry->RegisterListPref(prefs::kPinnedLauncherApps,
@@ skipping 13 matching lines @@
   registry->RegisterBooleanPref(prefs::kShowLogoutButtonInTray, false);
 }
 
 base::DictionaryValue* CreateAppDict(const std::string& app_id) {
   scoped_ptr<base::DictionaryValue> app_value(new base::DictionaryValue);
   app_value->SetString(kPinnedAppsPrefAppIDPath, app_id);
   return app_value.release();
 }
 
 }  // namespace ash