Re-enable ScrollingCoordinatorChromiumTest.touchOverflowScrolling on Android

The test was fixed by http://trac.webkit.org/changeset/139691 so we can
now turn it back on.

BUG=169975


Review URL: https://chromiumcodereview.appspot.com/11924002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@177142 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/pylib/gtest/filter/webkit_unit_tests_disabled

@@ -2,8 +2,6 @@
 
 # crbug.com/159935
 ScrollingCoordinatorChromiumTest.nonFastScrollableRegion
-# crbug.com/169975
-ScrollingCoordinatorChromiumTest.touchOverflowScrolling
 WebCompositorInputHandlerImplTest.gestureFlingAnimates
 WebCompositorInputHandlerImplTest.gestureFlingTransferResets
 WebPageSerializerTest.HTMLNodes