If a dialog is shown, drop fullscreen.

BUG=875066, 817809, 792876, 812769, 813815
TEST=included

Change-Id: Ic3d697fa3c4b01f5d7fea77391857177ada660db
Reviewed-on: https://chromium-review.googlesource.com/1185208
Reviewed-by: Sidney San Martín <sdy@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586418}
  base::string16 GetFirstPageTitle() {
    return ASCIIToUTF16(kFirstPageTitle);
  }

  base::string16 GetFirstPageTitle() {
    return ASCIIToUTF16(kFirstPageTitle);
  }
