Forward scrolling methods from BrowserAccessibilityComWin to AXPlatformNodeWin

This moves scrolling methods on IAccessible2.

Bug: 703369
Change-Id: I5ae512eebd6117d37e45e11d2df274e42dd392a2
Reviewed-on: https://chromium-review.googlesource.com/622357
Commit-Queue: Doug Turner <dougt@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#499823}
6 files changed