Ignore all non-gesture events in TouchEditableImplAura
Currently, in TouchEditableImplAura, touch events are ignored and all
other non-gesture events deactivate touch editing. Since, this
deactivation is now handled properly in TouchSelectionControllerImpl as
an ENV pre-target handler, we can safely ignore all non-gesture events
in TouchEditableImplAura.
BUG=377596
Review URL: https://codereview.chromium.org/
304503010
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273388 0039d316-1c4b-4281-b951-d872f2087c98