Stop using SfVsyncFrameCallbackProvider in InsetsController

This CL makes InsetsController use Choreographer as the provider of the
frame callbacks when animating.

Fix: 286465589
Flag: NA
Test: Toggle the visibilities of system bars and IME in the testing app:
      Window Insets Tests.
Change-Id: I8d5a0e02a93e0b94c0cf93ba02c195553b06179a