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pixels per mouse_scroll_wheel_tick was being set wrong (should have
been wheel_scroll_factor but was the value divided by dip_scale
was set), hence decreased the scroll rate and caused the regression.
This CL fixes the issue. Now WindowAndroid stores wheel_scroll_factor
(instead of tick multiplier) which is accessed much more often, for
efficiency's sake.

Bug: 821101
Change-Id: I99e81fdfc21ec101a99092c50555be4f429d7a20
Reviewed-on: https://chromium-review.googlesource.com/961503Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543013}