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

chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller_unittest.mm

 // 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 "base/command_line.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/sync/glue/session_model_associator.h"
@@ skipping 184 matching lines @@
 
   controller_.reset();
   fake_model_.reset();
 }
 
 TEST_F(WrenchMenuControllerTest, RecentTabsElideTitle) {
   // Add 1 session with 1 window and 2 tabs.
   RecentTabsBuilderTestHelper recent_tabs_builder;
   recent_tabs_builder.AddSession();
   recent_tabs_builder.AddWindow(0);
-  base::string16 tab1_short_title = ASCIIToUTF16("Short");
+  base::string16 tab1_short_title = base::ASCIIToUTF16("Short");
   recent_tabs_builder.AddTabWithInfo(0, 0, base::Time::Now(), tab1_short_title);
-  base::string16 tab2_long_title = ASCIIToUTF16("Very very very very very very "
-                                          "very very very very very very long");
+  base::string16 tab2_long_title = base::ASCIIToUTF16(
+      "Very very very very very very very very very very very very long");
   recent_tabs_builder.AddTabWithInfo(0, 0,
       base::Time::Now() - base::TimeDelta::FromMinutes(10), tab2_long_title);
   RegisterRecentTabs(&recent_tabs_builder);
 
   RecentTabsSubMenuModel recent_tabs_sub_menu_model(
       NULL, browser(), GetOpenTabsDelegate());
   fake_model_->AddSubMenuWithStringId(
       IDC_RECENT_TABS_MENU, IDS_RECENT_TABS_MENU,
       &recent_tabs_sub_menu_model);
 
@@ skipping 38 matching lines @@
 }
 
 // Verify that |RecentTabsMenuModelDelegate| is deleted before the model
 // it's observing.
 TEST_F(WrenchMenuControllerTest, RecentTabDeleteOrder) {
   [controller_ menuNeedsUpdate:[controller_ menu]];
   // If the delete order is wrong then the test will crash on exit.
 }
 
 }  // namespace