Move ReadFileToString to the base namespace.

chrome/browser/user_style_sheet_watcher.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/user_style_sheet_watcher.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 104 matching lines @@
   base::FilePath style_sheet_dir = style_sheet_file.DirName();
   if (!base::DirectoryExists(style_sheet_dir)) {
     if (!file_util::CreateDirectory(style_sheet_dir))
       return;
   }
   // Create the file if it doesn't exist.
   if (!base::PathExists(style_sheet_file))
     file_util::WriteFile(style_sheet_file, "", 0);
 
   std::string css;
-  bool rv = file_util::ReadFileToString(style_sheet_file, &css);
+  bool rv = base::ReadFileToString(style_sheet_file, &css);
   GURL style_sheet_url;
   if (rv && !css.empty()) {
     std::string css_base64;
     rv = base::Base64Encode(css, &css_base64);
     if (rv) {
       // WebKit knows about data urls, so convert the file to a data url.
       const char kDataUrlPrefix[] = "data:text/css;charset=utf-8;base64,";
       style_sheet_url = GURL(kDataUrlPrefix + css_base64);
     }
   }
@@ skipping 71 matching lines @@
   if (profile_->IsSameProfile(Profile::FromBrowserContext(
           content::Source<WebContents>(source)->GetBrowserContext()))) {
     loader_->NotifyLoaded();
     registrar_.RemoveAll();
   }
 }
 
 void UserStyleSheetWatcher::ShutdownOnUIThread() {
   registrar_.RemoveAll();
 }