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Only the current NTP should receive the keyboard events.
Replace the broadcast of notification by a direct call.

Bug: 1032999, 778008
Change-Id: I8d42fac5fe81cd08fc56742ebe01abe0989ff5c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039412Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742113}