Drop ui::TouchEvent shims for radius_{x,y} and force

Drop ui::TouchEvent shims for radius_{x,y} and force

The users of these shims have been replaced with direct access to the
underlying PointerDetails class.

This change also makes the TouchEvent/MouseEvent::pointer_event()
accessor const so it can be used on variables declared const.

BUG=516706
TEST=Run through all the trybots.

Committed: https://crrev.com/27a8f5c7873d4e990cd1b87f00c0888427b370d3
Cr-Commit-Position: refs/heads/master@{#347380}

[robert.bradford, 2015-08-20 14:48:53]

Patchset #1 (id:1) has been deleted

[robert.bradford, 2015-08-20 14:49:13]

The CQ bit was checked by robert.bradford@intel.com to run a CQ dry run

[commit-bot: I haz the power, 2015-08-20 14:49:48]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1300803003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1300803003/20001

[robert.bradford, 2015-08-20 16:05:20]

robert.bradford@intel.com changed reviewers:
+ oshima@chromium.org, sadrul@chromium.org, sky@chromium.org

[robert.bradford, 2015-08-20 16:05:21]

Hi folks, please take a look at this change which is a follow-up to my (now
landed) PE enabling CL.

sadrul@ for ui/
oshima@ for ash/
sky@ for mojo/

[commit-bot: I haz the power, 2015-08-20 19:55:30]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-20 19:55:30]

Dry run: This issue passed the CQ dry run.

[oshima, 2015-08-21 23:42:30]

I'll wait for sadul's approval for changes in ui/events.

[sadrul, 2015-08-21 23:45:01]

lgtm

[robert.bradford, 2015-09-03 15:55:47]

Ping oshima@ and sky@ could you review as owners of ash/ and mojo/ ?

[sky, 2015-09-03 18:00:26]

LGTM

[oshima, 2015-09-04 04:52:16]

lgtm

[robert.bradford, 2015-09-04 10:17:56]

The CQ bit was checked by robert.bradford@intel.com

[robert.bradford, 2015-09-04 10:17:56]

The patchset sent to the CQ was uploaded after l-g-t-m from sadrul@chromium.org
Link to the patchset: https://codereview.chromium.org/1300803003/#ps40001
(title: "Rebase")

[commit-bot: I haz the power, 2015-09-04 10:18:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1300803003/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1300803003/40001

[commit-bot: I haz the power, 2015-09-04 11:17:55]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-09-04 11:18:29]

Patchset 2 (id:??) landed as
https://crrev.com/27a8f5c7873d4e990cd1b87f00c0888427b370d3
Cr-Commit-Position: refs/heads/master@{#347380}