Disable ExternalPopupMenuRemoveTest.RemoveOnChange.

The behavior was intentionally changed by Blink r200000 [1].

[1] https://src.chromium.org/viewvc/blink?revision=200000&view=revision

BUG=516945
TBR=keishi@chromium.org,avi@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1271223002

Cr-Commit-Position: refs/heads/master@{#341867}
1 file changed