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The reply button should be white when the textfield is not empty, and should be transparent white when the textfield is empty.
However, when text is cut or pasted using mouse or finger and the textfield become empty or not, the reply button color does not change.
This CL resolved this bug.

Bug=803759

Change-Id: Ie307a924b41bddc88f60d9dc1b7ab230e639e0c7
Reviewed-on: https://chromium-review.googlesource.com/890843
Commit-Queue: Megumi Hattori <megumihattori@google.com>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533187}