touch: Fix unit_tests crash.
touch: Fix unit_tests crash.

Setup XInput2 events only for the regular windows (and not for temporary ones). This was causing unit_tests to crash.

BUG=unit_tests crashes for touch
TEST=unit_tests

Review URL: http://codereview.chromium.org/6602050

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@76461 0039d316-1c4b-4281-b951-d872f2087c98

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