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This CL clears some resources in the destructor of
FrameSequenceTrackerCollection class. No behavior change is expected.

Bug: None
Change-Id: Ib6af1f21e1ce19c31645e50f0009941dc7303d8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2292922Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787912}