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

chrome/browser/ui/cocoa/extensions/extension_installed_bubble_controller.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/extensions/extension_installed_bubble_controller.h"
 
 #include "base/i18n/rtl.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/mac_util.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 448 matching lines @@
     // it with text (it tells you it is single-line even if it is multiline), so
     // here the hidden howToUse_ TextField is temporarily repurposed to
     // calculate the correct height for the TextView.
     [[howToUse_ cell] setAttributedStringValue:[promo_ attributedString]];
     [GTMUILocalizerAndLayoutTweaker
           sizeToFitFixedWidthTextField:howToUse_];
     sync_promo_height = NSHeight([howToUse_ frame]);
   }
 
   // First part of extension installed message, the heading.
-  base::string16 extension_name = UTF8ToUTF16(extension_->name().c_str());
+  base::string16 extension_name = base::UTF8ToUTF16(extension_->name().c_str());
   base::i18n::AdjustStringForLocaleDirection(&extension_name);
   [heading_ setStringValue:l10n_util::GetNSStringF(
       IDS_EXTENSION_INSTALLED_HEADING, extension_name)];
   [GTMUILocalizerAndLayoutTweaker
       sizeToFitFixedWidthTextField:heading_];
   newWindowHeight += NSHeight([heading_ frame]) +
       extension_installed_bubble::kInnerVerticalMargin;
 
   // If type is browser/page action, include a special message about them.
   if (type_ == extension_installed_bubble::kBrowserAction ||
       type_ == extension_installed_bubble::kPageAction) {
     [howToUse_ setStringValue:[self
         installMessageForCurrentExtensionAction]];
     [howToUse_ setHidden:NO];
     [[howToUse_ cell]
         setFont:[NSFont systemFontOfSize:[NSFont smallSystemFontSize]]];
     [GTMUILocalizerAndLayoutTweaker
         sizeToFitFixedWidthTextField:howToUse_];
     newWindowHeight += NSHeight([howToUse_ frame]) +
         extension_installed_bubble::kInnerVerticalMargin;
   }
 
   // If type is omnibox keyword, include a special message about the keyword.
   if (type_ == extension_installed_bubble::kOmniboxKeyword) {
     [howToUse_ setStringValue:l10n_util::GetNSStringF(
         IDS_EXTENSION_INSTALLED_OMNIBOX_KEYWORD_INFO,
-        UTF8ToUTF16(extensions::OmniboxInfo::GetKeyword(extension_)))];
+        base::UTF8ToUTF16(extensions::OmniboxInfo::GetKeyword(extension_)))];
     [howToUse_ setHidden:NO];
     [[howToUse_ cell]
         setFont:[NSFont systemFontOfSize:[NSFont smallSystemFontSize]]];
     [GTMUILocalizerAndLayoutTweaker
         sizeToFitFixedWidthTextField:howToUse_];
     newWindowHeight += NSHeight([howToUse_ frame]) +
         extension_installed_bubble::kInnerVerticalMargin;
   }
 
   // If type is app, hide howToManage_, and include a "show me" link in the
@@ skipping 189 matching lines @@
   ExtensionInstallUI::OpenAppInstalledUI(browser_->profile(), extension_->id());
 }
 
 - (void)awakeFromNib {
   if (bundle_)
     return;
   [self initializeLabel];
 }
 
 @end