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Currently selection handles are being hidden on tap event. But in case
of tapping on image, the selection doesnt get cleared and we dont
receive any bounds changed message from blink, hence selection stays
but the handles are hidden. Hiding the handles on tap event is not
necessary as it is already handled when the selection bounds change

BUG=404625

Review URL: https://codereview.chromium.org/482723002

Cr-Commit-Position: refs/heads/master@{#290814}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290814 0039d316-1c4b-4281-b951-d872f2087c98