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

chrome/browser/status_icons/status_icon_menu_model_unittest.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 "chrome/browser/status_icons/status_icon_menu_model.h"
 
 #include "base/compiler_specific.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/status_icons/status_icon.h"
 #include "chrome/browser/status_icons/status_tray.h"
 #include "grit/chrome_unscaled_resources.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
 
+using base::ASCIIToUTF16;
+
 class StatusIconMenuModelTest : public testing::Test,
                                 public StatusIconMenuModel::Observer {
  public:
   virtual void SetUp() OVERRIDE {
     menu_.reset(new StatusIconMenuModel(NULL));
     menu_->AddObserver(this);
     changed_count_ = 0;
   }
 
   virtual void TearDown() OVERRIDE {
@@ skipping 81 matching lines @@
 
   // Ensure changes to one menu item does not affect the other menu item.
   EXPECT_FALSE(menu_model()->GetAcceleratorForCommandId(1, &accel_arg));
   EXPECT_EQ(base::string16(), menu_model()->GetLabelForCommandId(1));
   EXPECT_EQ(base::string16(), menu_model()->GetSublabelForCommandId(0));
   EXPECT_FALSE(menu_model()->GetIconForCommandId(0, &image_arg));
 
   // Menu state should have changed 8 times in this test.
   EXPECT_EQ(8, changed_count());
 }