Tiling: Fix amazon.com paint issue
Tiling: Fix amazon.com paint issue

Navigating to amazon.com will causes a dead loop to increase contents
size.
Fix it by:
1. use Widget::resize instead of setFrameRect in setViewportSize
2. enable delegatesScrolling mode of FrameView
3. avoid to turn off usedFixedLayout of ScrollView.
A corresponding commit is pushed to WebKit branch also.

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser