Move EmptyString, kWhitespace and the BOM to base.

chrome/browser/background/background_contents_service.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/background/background_contents_service.h"
 
 #include "apps/app_load_service.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 730 matching lines @@
   return (it != contents_map_.end()) ? it->second.contents : NULL;
 }
 
 const string16& BackgroundContentsService::GetParentApplicationId(
     BackgroundContents* contents) const {
   for (BackgroundContentsMap::const_iterator it = contents_map_.begin();
        it != contents_map_.end(); ++it) {
     if (contents == it->second.contents)
       return it->first;
   }
-  return EmptyString16();
+  return base::EmptyString16();
 }
 
 void BackgroundContentsService::AddWebContents(
     WebContents* new_contents,
     WindowOpenDisposition disposition,
     const gfx::Rect& initial_pos,
     bool user_gesture,
     bool* was_blocked) {
   Browser* browser = chrome::FindLastActiveWithProfile(
       Profile::FromBrowserContext(new_contents->GetBrowserContext()),
       chrome::GetActiveDesktop());
   if (browser) {
     chrome::AddWebContents(browser, NULL, new_contents, disposition,
                            initial_pos, user_gesture, was_blocked);
   }
 }