Turn the background of the scrolling area white.
Turn the background of the scrolling area white.

BUG=25594
TEST=background is white
Review URL: http://codereview.chromium.org/332011

git-svn-id: http://src.chromium.org/svn/trunk/src@29926 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 853ec8c540ac5cf984d7f05cf0e6c29b3d0308c5
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser