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MediaSessionAction sets are guaranteed to be small.
So we are using base::flat_set instead of std::set for
MediaSessionAction sets.

Bug: 1003847
Signed-off-by: Imranur Rahman <i.rahman@samsung.com>
Change-Id: I2672cd26443c62940da2c168e4563a341ea74158
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824723
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709495}