Get rid of ScrollView.

sky/engine/platform/FrameWidget.h

Index: sky/engine/platform/FrameWidget.h
diff --git a/sky/engine/platform/FrameWidget.h b/sky/engine/platform/FrameWidget.h
new file mode 100644
index 0000000000000000000000000000000000000000..d01b0b0d49484e66b8bfd01993052f4f07bcebe1
--- /dev/null
+++ b/sky/engine/platform/FrameWidget.h
@@ -0,0 +1,23 @@
+// 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.
+
+#ifndef FrameWidget_h
+#define FrameWidget_h
+
+#include "platform/Widget.h"
+
+namespace blink {
+
+class Widget;
+
+class FrameWidget : public Widget {
+public:
+    virtual void removeChild(Widget*) = 0;
+}; // class FrameWidget
+
+DEFINE_TYPE_CASTS(FrameWidget, Widget, widget, widget->isFrameView(), widget.isFrameView());
+
+} // namespace blink
+
+#endif // FrameWidget_h