Remove Widget's dependency upon its own inheritor aka ScrollView. This was nasty from an OO design…

Source/core/platform/chromium/PlatformScreenChromium.cpp

 /*
  * Copyright (c) 2008, 2009, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/platform/PlatformScreen.h"
 
-#include "core/platform/ScrollView.h"
+#include "core/platform/Widget.h"
 #include "platform/HostWindow.h"
 #include "platform/geometry/FloatRect.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebScreenInfo.h"
 
 namespace WebCore {
 
 static HostWindow* toHostWindow(Widget* widget)
 {
     if (!widget)
         return 0;
-    ScrollView* root = widget->root();
+    Widget* root = widget->root();
     if (!root)
         return 0;
     return root->hostWindow();
 }
 
 int screenDepth(Widget* widget)
 {
     HostWindow* hostWindow = toHostWindow(widget);
     if (!hostWindow)
         return 0;
@@ skipping 33 matching lines @@
 }
 
 void screenColorProfile(ColorProfile& toProfile)
 {
     WebKit::WebVector<char> profile;
     WebKit::Platform::current()->screenColorProfile(&profile);
     toProfile.append(profile.data(), profile.size());
 }
 
 } // namespace WebCore