Remove layout test expectations in platform/chromium-*.

It seems that these were inadvertently added after bug 231188 was fixed.

As far as I can tell, run-webkit-tests ignores these files, so they can safely be removed.

The expected result at LayoutTests/fast/events/touch/compositor-touch-hit-rects-scroll-expected.txt still exists.

BUG=

Review URL: https://chromiumcodereview.appspot.com/22504003

git-svn-id: svn://svn.chromium.org/blink/trunk@155898 bbb929c8-8fbe-4397-9dbb-9b2b20218538