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When an inner WebContents is fullscreen, and has focus, pressing <esc>
causes the keyboard event to be handled by that webcontents. But it
should instead be handled by the outermost WebContents so that it can
get to the appropriate delegate.

Bug: 1013640
Change-Id: I4ff81bea8cd9fa43259dde39b3bc479f6fd06f07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896771Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714386}