Make MouseWheelEvent::UpdateForRootTransform() not scale the mouse wheel offset

Make MouseWheelEvent::UpdateForRootTransform() not scale the mouse wheel offset

The mouse wheel offset is already in "DIPs" because one "mouse wheel click"
generates the same offset regardless of the device scale factor. Remove extra
scaling done by MouseWheelEvent::UpdateForRootTransform()

BUG=412560
TEST=Manual, see bug

Committed: https://crrev.com/d450c33f7333878275fc1e94d875691cf08dfeb3
Cr-Commit-Position: refs/heads/master@{#322028}

[pkotwicz, 2015-03-24 00:09:41]

pkotwicz@chromium.org changed reviewers:
+ girard@chromium.org

[pkotwicz, 2015-03-24 00:09:41]

girard@ PTAL

I think you added MouseWheelEvent::UpdateForRootTransform() in
https://chromiumcodereview.appspot.com/16950030/

[girard, 2015-03-24 01:41:57]

On 2015/03/24 00:09:41, pkotwicz wrote:
> girard@ PTAL
> 
> I think you added MouseWheelEvent::UpdateForRootTransform() in
> https://chromiumcodereview.appspot.com/16950030/

Yes, I did add that code. (It was needed at the time, but since then
https://chromiumcodereview.appspot.com/23452037 changed the units used for
scrolling.)

This code is correct.

LGTM

[pkotwicz, 2015-03-24 14:06:08]

pkotwicz@chromium.org changed reviewers:
+ sadrul@chromium.org

[pkotwicz, 2015-03-24 14:06:08]

Sadrul for OWNERS

[sadrul, 2015-03-24 16:31:47]

lgtm

[pkotwicz1, 2015-03-24 17:05:42]

The CQ bit was checked by pkotwicz@google.com

[commit-bot: I haz the power, 2015-03-24 17:05:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1027193003/1

[commit-bot: I haz the power, 2015-03-24 17:44:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-24 17:45:37]

Patchset 1 (id:??) landed as
https://crrev.com/d450c33f7333878275fc1e94d875691cf08dfeb3
Cr-Commit-Position: refs/heads/master@{#322028}