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Remove flakiness expectation for paint/invalidation/selection/selection-partial-invalidation-between-blocks.html

It's no longer flaky:
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=paint%2Finvalidation%2Fselection%2Fselection-partial-invalidation-between-blocks.html

TBR=yoichio@chromium.org

Bug: 774437
Change-Id: I40e82ad1c5cab68d9996961eba44394edf26ed7f
Reviewed-on: https://chromium-review.googlesource.com/1220171Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590423}