Re-enable TouchActionTest.Pan on Android.

With the fix of 411038 in (https://codereview.chromium.org/1162083003).
Re-enable the failing test on Android Nexus 5.

BUG=412145
TEST=build/android/test_runner.py gtest --debug -s webkit_unit_tests \
     --num_retries=0 --gtest-filter=TouchActionTest.Pan

Review URL: https://codereview.chromium.org/1156373015

Cr-Commit-Position: refs/heads/master@{#333072}

build/android/pylib/gtest/filter/webkit_unit_tests_disabled

@@ -23,6 +23,3 @@ DeferredImageDecoderTest.drawIntoSkPictureProgressive
 
 # crbug.com/320005
 CoreAnimationCompositorAnimationsTest.ConvertTimingForCompositorIterationCount
-
-# crbug.com/412145
-TouchActionTest.Pan