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Fix a typo in CreateMappedVideoFrame()'s documentation: no memory is
deallocated by the destruction observer, we are simply removing a
mapping to the user process address space.

Bug: 856562
Test: None

Change-Id: I7be56440a4a743a3f78cc9a0c60aec27881c2e57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610663
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659389}