Make UTF16ToASCII and UTF16TOUTF8 take a StringPiece

content/child/notifications/notification_data_conversions.cc

 // Copyright 2014 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/child/notifications/notification_data_conversions.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 
 using blink::WebNotificationData;
 
 namespace content {
 
 PlatformNotificationData ToPlatformNotificationData(
     const WebNotificationData& web_data) {
   PlatformNotificationData platform_data;
   platform_data.title = web_data.title;
   platform_data.direction =
       web_data.direction == WebNotificationData::DirectionLeftToRight
           ? PlatformNotificationData::NotificationDirectionLeftToRight
           : PlatformNotificationData::NotificationDirectionRightToLeft;
-  platform_data.lang = base::UTF16ToUTF8(web_data.lang);
+  platform_data.lang = base::UTF16ToUTF8(base::StringPiece16(web_data.lang));
   platform_data.body = web_data.body;
-  platform_data.tag = base::UTF16ToUTF8(web_data.tag);
+  platform_data.tag = base::UTF16ToUTF8(base::StringPiece16(web_data.tag));
   platform_data.icon = GURL(web_data.icon.string());
   platform_data.vibration_pattern.assign(web_data.vibrate.begin(),
                                          web_data.vibrate.end());
   platform_data.silent = web_data.silent;
   platform_data.data.assign(web_data.data.begin(), web_data.data.end());
 
   return platform_data;
 }
 
 WebNotificationData ToWebNotificationData(
@@ skipping 10 matching lines @@
   web_data.tag = blink::WebString::fromUTF8(platform_data.tag);
   web_data.icon = blink::WebURL(platform_data.icon);
   web_data.vibrate = platform_data.vibration_pattern;
   web_data.silent = platform_data.silent;
   web_data.data = platform_data.data;
 
   return web_data;
 }
 
 }  // namespace content