WebMediaPlayerMSCompositor cleanup

In WebMediaPlayerMSCompositor, GetCurentFrame() no longer has side effect.
This CL removes GetCurrentFrameWithoutUpdatingStatistics() and uses
GetCurrentFrame() instead. This CL also removes an outdated comment.

Bug: 948472

Change-Id: If18ccb69cfe47a8944bdb91a1a8cf72f91d34985
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542783
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652505}
4 files changed