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And replaces with hit_test_data_.size().

BUG=none
TEST=none

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I0bd21c5cfe5ced5df871dc9ed419a291b4633018
Reviewed-on: https://chromium-review.googlesource.com/1239168Reviewed-by: Ria Jiang <riajiang@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593352}