Update uses of UTF conversions in content/ to use the base:: namespace.

content/browser/accessibility/accessibility_tree_formatter_gtk.cc

 // Copyright 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.
 
 #include "content/browser/accessibility/accessibility_tree_formatter.h"
 
 #include <atk/atk.h>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 56 matching lines @@
     if ((*it)->GetAsString(&state_value))
       WriteAttribute(true, state_value, &line);
   }
 
   int id_value;
   node.GetInteger("id", &id_value);
   WriteAttribute(false,
                  base::StringPrintf("id=%d", id_value),
                  &line);
 
-  return indent + line + ASCIIToUTF16("\n");
+  return indent + line + base::ASCIIToUTF16("\n");
 }
 
 void AccessibilityTreeFormatter::Initialize() {}
 
 // static
 const base::FilePath::StringType
 AccessibilityTreeFormatter::GetActualFileSuffix() {
   return FILE_PATH_LITERAL("-actual-gtk.txt");
 }
 
@@ skipping 12 matching lines @@
 const std::string AccessibilityTreeFormatter::GetAllowString() {
   return "@GTK-ALLOW:";
 }
 
 // static
 const std::string AccessibilityTreeFormatter::GetDenyString() {
   return "@GTK-DENY:";
 }
 
 }