Linux: don't drop invalid scroll requests.
Linux: don't drop invalid scroll requests.

When performing an anchor jump, WebKit will send a scroll request with
an invalid scroll magnitude (greater than the size of the window). We
must still process the paint request attached however.

BUG=10494
http://codereview.chromium.org/67132


git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@13682 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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