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

chrome/browser/ui/cocoa/extensions/extension_uninstall_dialog_cocoa.mm

 // Copyright (c) 2011 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/extensions/extension_uninstall_dialog.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
 
@@ skipping 41 matching lines @@
   // Clear the key equivalent (currently 'Return') because cancel is the default
   // button.
   [continueButton setKeyEquivalent:@""];
 
   NSButton* cancelButton = [alert addButtonWithTitle:l10n_util::GetNSString(
       IDS_CANCEL)];
   [cancelButton setKeyEquivalent:@"\r"];
 
   [alert setMessageText:l10n_util::GetNSStringF(
        IDS_EXTENSION_UNINSTALL_PROMPT_HEADING,
-       UTF8ToUTF16(extension_->name()))];
+       base::UTF8ToUTF16(extension_->name()))];
   [alert setAlertStyle:NSWarningAlertStyle];
   [alert setIcon:gfx::NSImageFromImageSkia(icon_)];
 
   if ([alert runModal] == NSAlertFirstButtonReturn)
     delegate_->ExtensionUninstallAccepted();
   else
     delegate_->ExtensionUninstallCanceled();
 }
 
 }  // namespace
 
 // static
 ExtensionUninstallDialog* ExtensionUninstallDialog::Create(
     Profile* profile,
     Browser* browser,
     Delegate* delegate) {
   return new ExtensionUninstallDialogCocoa(profile, browser, delegate);
 }