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In applying the fix for Issue 1002598, we changed behaviour by
transforming coordinates for the case where outer and outer-most
WebContents are the same, and this seems to cause Issue 1015298.
This CL makes it so we only transform when there are different
outer and outer-most WebContents.

Bug: 1015298
Change-Id: I390bf37ca72cdfb5a2596721046e2c9937496df1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879597
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709924}