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

chrome/browser/spellchecker/misspelling.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 a single spellcheck suggestion.
 //
 // Stores the spellcheck suggestion, its uint32 hash identifier, and user's
 // feedback. The feedback is indirect, in the sense that we record user's
 // |action| instead of asking them how they feel about a spellcheck suggestion.
 // The object can serialize itself.
 
 #ifndef CHROME_BROWSER_SPELLCHECKER_MISSPELLING_H_
 #define CHROME_BROWSER_SPELLCHECKER_MISSPELLING_H_
 
 #include <vector>
 
 #include "base/time/time.h"
 #include "chrome/browser/spellchecker/spellcheck_action.h"
 
 // Stores user feedback to a spellcheck suggestion. Sample usage:
 //    Misspelling misspelling.
-//    misspelling.context = ASCIIToUTF16("Helllo world");
+//    misspelling.context = base::ASCIIToUTF16("Helllo world");
 //    misspelling.location = 0;
 //    misspelling.length = 6;
 //    misspelling.suggestions =
-//        std::vector<base::string16>(1, ASCIIToUTF16("Hello"));
+//        std::vector<base::string16>(1, base::ASCIIToUTF16("Hello"));
 //    misspelling.hash = GenerateRandomHash();
 //    misspelling.action.type = SpellcheckAction::TYPE_SELECT;
 //    misspelling.action.index = 0;
 //    Process(misspelling.Serialize());
 class Misspelling {
  public:
   Misspelling();
   Misspelling(const base::string16& context,
               size_t location,
               size_t length,
@@ skipping 26 matching lines @@
   uint32 hash;
 
   // User action.
   SpellcheckAction action;
 
   // The time when the user applied the action.
   base::Time timestamp;
 };
 
 #endif  // CHROME_BROWSER_SPELLCHECKER_MISSPELLING_H_