Use explicit WebString conversions in extensions/

extensions/renderer/extension_frame_helper.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 "extensions/renderer/extension_frame_helper.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_util.h"
 #include "base/timer/elapsed_timer.h"
 #include "content/public/renderer/render_frame.h"
@@ skipping 32 matching lines @@
 
   // Not all frames have a valid ViewType, e.g. devtools, most GuestViews, and
   // unclassified detached WebContents.
   if (frame_helper->view_type() == VIEW_TYPE_INVALID)
     return false;
 
   // This logic matches ExtensionWebContentsObserver::GetExtensionFromFrame.
   blink::WebSecurityOrigin origin =
       frame_helper->render_frame()->GetWebFrame()->getSecurityOrigin();
   if (origin.isUnique() ||
-      !base::EqualsASCII(base::StringPiece16(origin.protocol()),
-                         kExtensionScheme) ||
-      !base::EqualsASCII(base::StringPiece16(origin.host()),
-                         match_extension_id.c_str()))
+      !base::EqualsASCII(origin.protocol().utf16(), kExtensionScheme) ||
+      !base::EqualsASCII(origin.host().utf16(), match_extension_id.c_str()))
     return false;
 
   if (match_window_id != extension_misc::kUnknownWindowId &&
       frame_helper->browser_window_id() != match_window_id)
     return false;
 
   if (match_tab_id != extension_misc::kUnknownTabId &&
       frame_helper->tab_id() != match_tab_id)
     return false;
 
@@ skipping 251 matching lines @@
     const base::ListValue& args) {
   extension_dispatcher_->InvokeModuleSystemMethod(
       render_frame(), extension_id, module_name, function_name, args);
 }
 
 void ExtensionFrameHelper::OnDestruct() {
   delete this;
 }
 
 }  // namespace extensions