Add explicit base namespace to string16 users.

chrome/common/extensions/manifest_handlers/minimum_chrome_version_checker.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 "chrome/common/extensions/manifest_handlers/minimum_chrome_version_checker.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "base/version.h"
 #include "chrome/common/chrome_version_info.h"
 #include "extensions/common/error_utils.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest_constants.h"
 #include "grit/chromium_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace extensions {
 
 namespace keys = manifest_keys;
 namespace errors = manifest_errors;
 
 MinimumChromeVersionChecker::MinimumChromeVersionChecker() {
 }
 
 MinimumChromeVersionChecker::~MinimumChromeVersionChecker() {
 }
 
-bool MinimumChromeVersionChecker::Parse(Extension* extension, string16* error) {
+bool MinimumChromeVersionChecker::Parse(Extension* extension,
+                                        base::string16* error) {
   std::string minimum_version_string;
   if (!extension->manifest()->GetString(keys::kMinimumChromeVersion,
                                         &minimum_version_string)) {
     *error = ASCIIToUTF16(errors::kInvalidMinimumChromeVersion);
     return false;
   }
 
   Version minimum_version(minimum_version_string);
   if (!minimum_version.IsValid()) {
     *error = ASCIIToUTF16(errors::kInvalidMinimumChromeVersion);
@@ skipping 15 matching lines @@
     return false;
   }
   return true;
 }
 
 const std::vector<std::string> MinimumChromeVersionChecker::Keys() const {
   return SingleKey(keys::kMinimumChromeVersion);
 }
 
 }  // namespace extensions