Make it possible to run Sky apps offline

sky/engine/core/script/dom_dart_state.h

 // Copyright 2015 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.
 
 #ifndef SKY_ENGINE_CORE_SCRIPT_DOM_DART_STATE_H_
 #define SKY_ENGINE_CORE_SCRIPT_DOM_DART_STATE_H_
 
 #include "dart/runtime/include/dart_api.h"
 #include "sky/engine/tonic/dart_state.h"
 #include "sky/engine/core/dom/Document.h"
 #include "sky/engine/wtf/RefPtr.h"
 
 namespace blink {
 class LocalFrame;
 class LocalDOMWindow;
 
 class DOMDartState : public DartState {
  public:
-  explicit DOMDartState(Document* document, const KURL& url);
+  explicit DOMDartState(Document* document, const String& url);
   ~DOMDartState() override;
 
   virtual void DidSetIsolate();
 
   static DOMDartState* Current();
 
   static Document* CurrentDocument();
   static LocalFrame* CurrentFrame();
   static LocalDOMWindow* CurrentWindow();
 
-  const KURL& url() const { return url_; }
+  const String& url() const { return url_; }
 
   Document* document() const { return document_.get(); }
 
   // Cached handles to strings used in Dart/C++ conversions.
   Dart_Handle x_handle() { return x_handle_.value(); }
   Dart_Handle y_handle() { return y_handle_.value(); }
   Dart_Handle value_handle() { return value_handle_.value(); }
   Dart_Handle color_class() { return color_class_.value(); }
 
  private:
   RefPtr<Document> document_;
-  KURL url_;
+  String url_;
 
   DartPersistentValue x_handle_;
   DartPersistentValue y_handle_;
   DartPersistentValue value_handle_;
   DartPersistentValue color_class_;
 };
 
 }  // namespace blink
 
 #endif // SKY_ENGINE_CORE_SCRIPT_DOM_DART_STATE_H_