Hide scrollbars in fast/text/sub-pixel/text-scaling-pixel.html

Hide scrollbars in the fast/text/sub-pixel/text-scaling-pixel.html test
to minimize platform differences.

R=dglazkov@chromium.org

Review URL: https://codereview.chromium.org/255653002

git-svn-id: svn://svn.chromium.org/blink/trunk@172562 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Unused class forward declarations in Page.

BUG=

Review URL: https://codereview.chromium.org/255453005

git-svn-id: svn://svn.chromium.org/blink/trunk@172563 bbb929c8-8fbe-4397-9dbb-9b2b20218538