Make FrameSequenceTrackerCollection's constructor default

This change makes the FrameSequenceTrackerCollection's dependency on
compositor_frame_reporting_controller optional, and is desirable for
frame sequence trackers that do not operate in layer_tree_host_impl
(e.g. trackers for videos and offscreen canvas)

Change-Id: I5624d0a351d89c806dd2de171a9cad6fb4f26b58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774223
Commit-Queue: Mingjing Zhang <[email protected]>
Reviewed-by: Sadrul Chowdhury <[email protected]>
Cr-Commit-Position: refs/heads/master@{#691235}
2 files changed