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

chrome/browser/spellchecker/feedback.h

 // Copyright (c) 2013 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.
 //
 // An object to store user feedback to spellcheck suggestions from spelling
 // service.
 //
 // Stores feedback for the spelling service in |Misspelling| objects. Each
 // |Misspelling| object is identified by a |hash| and corresponds to a document
 // marker with the same |hash| identifier in the renderer.
 
 #ifndef CHROME_BROWSER_SPELLCHECKER_FEEDBACK_H_
 #define CHROME_BROWSER_SPELLCHECKER_FEEDBACK_H_
 
 #include <map>
 #include <set>
 #include <vector>
 
 #include "chrome/browser/spellchecker/misspelling.h"
 
 namespace spellcheck {
 
 // Stores user feedback to spellcheck suggestions. Sample usage:
 //    Feedback feedback;
 //    feedback.AddMisspelling(renderer_process_id, Misspelling(
-//        ASCIIToUTF16("Helllo world"), 0, 6, std::vector<base::string16>(),
-//        GenerateRandomHash()));
+//        base::ASCIIToUTF16("Helllo world"), 0, 6,
+//        std::vector<base::string16>(), GenerateRandomHash()));
 //    feedback.FinalizeRemovedMisspellings(renderer_process_id,
 //                                         std::vector<uint32>());
 //    ProcessFeedback(feedback.GetMisspellingsInRenderer(renderer_process_id));
 //    feedback.EraseFinalizedMisspellings(renderer_process_id);
 class Feedback {
  public:
   Feedback();
   ~Feedback();
 
   // Returns the misspelling identified by |hash|. Returns NULL if there's no
@@ skipping 65 matching lines @@
 
   // A map of misspelled text to hashes that identify misspellings.
   TextHashesMap text_;
 
   DISALLOW_COPY_AND_ASSIGN(Feedback);
 };
 
 }  // namespace spellcheck
 
 #endif  // CHROME_BROWSER_SPELLCHECKER_FEEDBACK_H_