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 InkDrop is handled before View::OnMouseEvent() in OnMouseEvent().
So, If I want to override the functions associated with InkDrop(ex : CreateInkDropHighlight()),
there is a problem with not getting the something appropriate(ex. Button::STATE).

 But, changing the order of handling inkdrop and mouse event causes crashes on windows.
(See, http:://www.crbug.org/902279.)
The cause of this crashes is calling views::OnMouseEvent() might delete "this".
So We Check if it's being detroyed to avoid crashes.


Bug: none
Change-Id: I2051ddbff9d674418c42e8fd81fcd9a4ab47a984
Reviewed-on: https://chromium-review.googlesource.com/c/1335068Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611513}