Revert 228072 "CHECK to only receive touch/gesture events in tou..."

> CHECK to only receive touch/gesture events in touch selection tests
> 
> Added a CHECK in touch selection tests to make sure that we only receive
> touch or gesture events. Currently, some touch selection tests are flaky
> because sometimes they receive unexpected mouse events that end touch
> selection in the middle of the test. This CHECK will give us stack trace
> to investigate the situation.
> 
> BUG=235991,276870
> 
> Review URL: https://codereview.chromium.org/26275005

I think you have your stack traces now.

TBR=mohsen@chromium.org

Review URL: https://codereview.chromium.org/26966002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228100 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228100