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

chrome/browser/app_controller_mac.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/app_controller_mac.h"
 
 #include "apps/app_shim/app_shim_mac.h"
 #include "apps/app_shim/extension_app_shim_handler_mac.h"
 #include "apps/shell_window_registry.h"
 #include "base/auto_reset.h"
@@ skipping 1409 matching lines @@
       NSString* menuStr =
           l10n_util::GetNSStringWithFixup(IDS_BACKGROUND_APPS_MAC);
       base::scoped_nsobject<NSMenu> appMenu(
           [[NSMenu alloc] initWithTitle:menuStr]);
       for (extensions::ExtensionList::const_iterator cursor =
                applications.begin();
            cursor != applications.end();
            ++cursor, ++position) {
         DCHECK_EQ(applications.GetPosition(cursor->get()), position);
         NSString* itemStr =
-            base::SysUTF16ToNSString(UTF8ToUTF16((*cursor)->name()));
+            base::SysUTF16ToNSString(base::UTF8ToUTF16((*cursor)->name()));
         base::scoped_nsobject<NSMenuItem> appItem(
             [[NSMenuItem alloc] initWithTitle:itemStr
                                        action:@selector(executeApplication:)
                                 keyEquivalent:@""]);
         [appItem setTarget:self];
         [appItem setTag:position];
         [appMenu addItem:appItem];
       }
     }
   }
@@ skipping 42 matching lines @@
 
 //---------------------------------------------------------------------------
 
 namespace app_controller_mac {
 
 bool IsOpeningNewWindow() {
   return g_is_opening_new_window;
 }
 
 }  // namespace app_controller_mac