Move ReadFileToString to the base namespace.

chrome/browser/component_updater/default_component_installer.cc

 // Copyright 2013 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 "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/values.h"
 #include "base/version.h"
@@ skipping 103 matching lines @@
       }
     } else {
       latest_dir = path;
       latest_version = version;
       found = true;
     }
   }
 
   if (found) {
     current_version_ = latest_version;
-    file_util::ReadFileToString(latest_dir.AppendASCII("manifest.fingerprint"),
-                                &current_fingerprint_);
+    base::ReadFileToString(latest_dir.AppendASCII("manifest.fingerprint"),
+                           &current_fingerprint_);
   }
 
   // Remove older versions of the component. None should be in use during
   // browser startup.
   for (std::vector<base::FilePath>::iterator iter = older_dirs.begin();
        iter != older_dirs.end(); ++iter) {
    base::DeleteFile(*iter, true);
   }
 
   content::BrowserThread::PostTask(
@@ skipping 28 matching lines @@
   base::Version installed_version;
   if (current_version_.CompareTo(base::Version(kNullVersion)) <= 0) {
     content::BrowserThread::PostTask(
         content::BrowserThread::FILE, FROM_HERE,
         base::Bind(&ComponentInstallerTraits::ComponentReady,
                    base::Unretained(installer_traits_.get()),
                    installed_version,
                    GetInstallDirectory()));
   }
 }