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

chrome/browser/tab_contents/render_view_context_menu.h

 // 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.
 
 #ifndef CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_H_
 #define CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 54 matching lines @@
 //     virtual ~MyTask() {
 //     }
 //     virtual void OnURLFetchComplete(const net::URLFetcher* source,
 //                                     const GURL& url,
 //                                     const net::URLRequestStatus& status,
 //                                     int response,
 //                                     const net::ResponseCookies& cookies,
 //                                     const std::string& data) {
 //       bool enabled = response == 200;
 //       const char* text = enabled ? "OK" : "ERROR";
-//       proxy_->UpdateMenuItem(id_, enabled, ASCIIToUTF16(text));
+//       proxy_->UpdateMenuItem(id_, enabled, base::ASCIIToUTF16(text));
 //     }
 //     void Start(const GURL* url, net::URLRequestContextGetter* context) {
 //       fetcher_.reset(new URLFetcher(url, URLFetcher::GET, this));
 //       fetcher_->SetRequestContext(context);
 //       content::AssociateURLFetcherWithRenderView(
 //           fetcher_.get(),
 //           proxy_->GetRenderViewHost()->GetSiteInstance()->GetSite(),
 //           proxy_->GetRenderViewHost()->GetProcess()->GetID(),
 //           proxy_->GetRenderViewHost()->GetRoutingID());
 //       fetcher_->Start();
@@ skipping 208 matching lines @@
   // Guests are rendered inside chrome apps, but have most of the actions
   // that a regular web page has.
   // Currently actions/items that are suppressed from guests are: searching,
   // printing, speech and instant.
   bool is_guest_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewContextMenu);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_H_