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The issue can be reproduced by creating and closing windows really
fast (like when you're using a tiling WM and dragging tabs and it
sort of bugs out).  In that case the following was getting hit:
  CHECK(!swap_closures_.empty());

The solution is to do loop through |swap_closures_| and remove only
the matching element.

BUG=1057943
R=nickdiego

Change-Id: Ib55f6326df6c444adf1bdc6f710785a05cb0d619
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090354
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Nick Yamane <nickdiego@igalia.com>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747658}