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This does not change the current behavior, it simply opens a tab
by using chrome::Navigate().

However https://codereview.chromium.org/640103002/ will introduces
app-list search to Athena, then the direct use of chrome::Navigate()
is problematic. Athena will handle this method.

BUG=380875
R=xiyuan@chromium.org
TEST=no functional changes

Review URL: https://codereview.chromium.org/644863002

Cr-Commit-Position: refs/heads/master@{#299049}