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Currently there are two scenarios which will trigger SetPhotoOptions():
1. takePhoto() from ImageCapture API
2. applyConstraints() from MediaStreamTrack object

For (2), we don't need to reconfigure photo stream.

Bug: 1142931
Test: Manually
Change-Id: I2481d6925d2b4d8f3e99b24f9a03a9e1721c99c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517232
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823947}