Cleanup: Add fileapi::GetIsolatedFileSystemRootURIString

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 "base/file_path.h"
 #include "base/stringprintf.h"
@@ skipping 38 matching lines @@
     return v8::Undefined();
   }
   std::string name(*v8::String::Utf8Value(args[1]));
   if (name.empty()) {
     NOTREACHED();
     return v8::Undefined();
   }
 
   WebKit::WebFrame* webframe = WebKit::WebFrame::frameForCurrentContext();
   const GURL origin = GURL(webframe->document().securityOrigin().toString());
-  const GURL root_url =
-      fileapi::GetFileSystemRootURI(origin, fileapi::kFileSystemTypeIsolated);
-  const std::string url =
-      base::StringPrintf("%s%s/%s/", root_url.spec().c_str(), fsid.c_str(),
-                         extension_misc::kMediaFileSystemPathPart);
+  const std::string root_url =
+      fileapi::GetIsolatedFileSystemRootURIString(
+          origin, fsid, extension_misc::kMediaFileSystemPathPart);
   return webframe->createFileSystem(WebKit::WebFileSystem::TypeIsolated,
                                     WebKit::WebString::fromUTF8(name),
-                                    WebKit::WebString::fromUTF8(url));
+                                    WebKit::WebString::fromUTF8(root_url));
 }
 
 v8::Handle<v8::Value> MediaGalleriesCustomBindings::ExtractEmbeddedThumbnails(
     const v8::Arguments& args) {
   if (args.Length() != 1) {
     NOTREACHED() << "Bad arguments";
     return v8::Undefined();
   }
   // TODO(vandebo) Check that the object is a FileEntry.
 
   // TODO(vandebo) Create and return a Directory entry object.
   return v8::Null();
 }
 
 }  // namespace extensions