Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/storage_monitor/media_storage_util_unittest.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 <string>
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 122 matching lines @@
       base::Bind(&base::WaitableEvent::Signal, base::Unretained(&event));
 
   // We need signal_event to be executed on the FILE thread, as the test thread
   // is blocked. Therefore, we invoke FilterAttachedDevices on the FILE thread.
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
                           base::Bind(&MediaStorageUtil::FilterAttachedDevices,
                                      base::Unretained(&devices), signal_event));
   event.Wait();
   EXPECT_FALSE(devices.find(kImageCaptureDeviceId) != devices.end());
 
-  ProcessAttach(kImageCaptureDeviceId, ASCIIToUTF16("name"),
+  ProcessAttach(kImageCaptureDeviceId, base::ASCIIToUTF16("name"),
                 FILE_PATH_LITERAL("/location"));
   devices.insert(kImageCaptureDeviceId);
   event.Reset();
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
                           base::Bind(&MediaStorageUtil::FilterAttachedDevices,
                                      base::Unretained(&devices), signal_event));
   event.Wait();
 
   EXPECT_TRUE(devices.find(kImageCaptureDeviceId) != devices.end());
 }