Remove renamed applyScrollAndScale after removing uses in Chromium.

https://codereview.chromium.org/511253003/ replaced applyScrollAndScale
with applyViewportDeltas. This method can now be removed from the Blink
API.

BUG=333143

Review URL: https://codereview.chromium.org/557103002

git-svn-id: svn://svn.chromium.org/blink/trunk@181685 bbb929c8-8fbe-4397-9dbb-9b2b20218538