Revert of Clean up GestureEventDetails constructors and fix unit tests

Revert of Clean up GestureEventDetails constructors and fix unit tests (patchset #1 id:20001 of https://codereview.chromium.org/573963005/)

Reason for revert:
This broke TouchEditableImplAuraTest.TouchSelectionOnLongPressTest.
[24874:24874:0916/151803:584385367:FATAL:gesture_event_details.cc(54)] Check failed: false. Invalid event type for constructor: 32
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=undefined&tests=TouchEditableImplAuraTest.TouchSelectionOnLongPressTest&testType=content_browsertests

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=undefined&tests=TouchEditableImplAuraTest.TouchSelectionOnLongPressTest&testType=content_browsertests

Original issue's description:
> Clean up GestureEventDetails constructors and fix unit tests.
>
> A new version of Issue 565583005: Clean up GestureEventDetails
> constructors
> https://codereview.chromium.org/565583005/
>
> BUG=350942
>
> TBR=tdresser@chromium.org, jdduke@chromium.org, sadrul@chromium.org
>
> Committed: https://crrev.com/874611d5ab5b879648682c1ea41062bebc9c95e5
> Cr-Commit-Position: refs/heads/master@{#295144}

TBR=sky@chromium.org,lanwei@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=350942
Committed: https://crrev.com/f0003ece045e6e30ff3d70be4ea818c365b08cf6
Cr-Commit-Position: refs/heads/master@{#295223}

[horo, 2014-09-17 03:47:45]

Created Revert of Clean up GestureEventDetails constructors and fix unit tests

[commit-bot: I haz the power, 2014-09-17 03:48:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/577833003/1

[commit-bot: I haz the power, 2014-09-17 03:49:29]

Committed patchset #1 (id:1) as 6dfd07e2dedfa3dcbe5d2098bfd4e96398f80045

[commit-bot: I haz the power, 2014-09-17 03:49:59]

Patchset 1 (id:??) landed as
https://crrev.com/f0003ece045e6e30ff3d70be4ea818c365b08cf6
Cr-Commit-Position: refs/heads/master@{#295223}