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

chrome/browser/ui/cocoa/browser_window_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.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 
 #include "base/mac/mac_util.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
@@ skipping 642 matching lines @@
   [BrowserWindowController updateSigninItem:syncMenuItem
                                  shouldShow:NO
                              currentProfile:profile()];
   EXPECT_TRUE([[syncMenuItem title] isEqualTo:startSignin]);
   EXPECT_TRUE([syncMenuItem isHidden]);
 
   // Now sign in.
   std::string username = "foo@example.com";
   NSString* alreadySignedIn =
     l10n_util::GetNSStringFWithFixup(IDS_SYNC_MENU_SYNCED_LABEL,
-                                     UTF8ToUTF16(username));
+                                     base::UTF8ToUTF16(username));
   SigninManager* signin = SigninManagerFactory::GetForProfile(profile());
   signin->SetAuthenticatedUsername(username);
   ProfileSyncService* sync =
     ProfileSyncServiceFactory::GetForProfile(profile());
   sync->SetSyncSetupCompleted();
   [BrowserWindowController updateSigninItem:syncMenuItem
                                  shouldShow:YES
                              currentProfile:profile()];
   EXPECT_TRUE([[syncMenuItem title] isEqualTo:alreadySignedIn]);
   EXPECT_FALSE([syncMenuItem isHidden]);
@@ skipping 202 matching lines @@
   testFullscreenWindow_.reset(
       [[NSWindow alloc] initWithContentRect:NSMakeRect(0,0,400,400)
                                   styleMask:NSBorderlessWindowMask
                                     backing:NSBackingStoreBuffered
                                       defer:NO]);
   return testFullscreenWindow_.get();
 }
 @end
 
 /* TODO(???): test other methods of BrowserWindowController */