Reduce string copies in GURL creation

chrome/renderer/extensions/media_galleries_custom_bindings.cc

 // Copyright (c) 2012 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/renderer/extensions/media_galleries_custom_bindings.h"
 
 #include <string>
 
+#include "content/public/child/url_conversion.h"
 #include "extensions/renderer/script_context.h"
 #include "storage/common/fileapi/file_system_util.h"
 #include "third_party/WebKit/public/web/WebDOMFileSystem.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 
 MediaGalleriesCustomBindings::MediaGalleriesCustomBindings(
@@ skipping 10 matching lines @@
 void MediaGalleriesCustomBindings::GetMediaFileSystemObject(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK_EQ(1, args.Length());
   CHECK(args[0]->IsString());
 
   std::string fs_mount(*v8::String::Utf8Value(args[0]));
   CHECK(!fs_mount.empty());
 
   blink::WebLocalFrame* webframe =
       blink::WebLocalFrame::frameForCurrentContext();
-  const GURL origin = GURL(webframe->document().securityOrigin().toString());
+  const GURL origin = content::WebStringToGURL(
+      webframe->document().securityOrigin().toString());
   std::string fs_name =
       storage::GetFileSystemName(origin, storage::kFileSystemTypeExternal);
   fs_name.append("_");
   fs_name.append(fs_mount);
   const GURL root_url(
       storage::GetExternalFileSystemRootURIString(origin, fs_mount));
   args.GetReturnValue().Set(
       blink::WebDOMFileSystem::create(webframe,
                                       blink::WebFileSystemTypeExternal,
                                       blink::WebString::fromUTF8(fs_name),
                                       root_url)
           .toV8Value(context()->v8_context()->Global(), args.GetIsolate()));
 }
 
 }  // namespace extensions