Fix the regression caused by http://crrev.com/c/1288350.

Bug: 900124,856135
Change-Id: Ie11ad406bd1ea383dc2a83cc8661076309154865
Reviewed-on: https://chromium-review.googlesource.com/c/1317010
Reviewed-by: Lan Wei <azurewei@chromium.org>
Commit-Queue: Shu Chen <shuchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605282}
void ImeObserver::OnCompositionBoundsChanged(
    const std::vector<gfx::Rect>& bounds) {}

void ImeObserver::OnCompositionBoundsChanged(
    const std::vector<gfx::Rect>& bounds) {}
