Remove legacy edge extension code from SurfaceAnimationRunner

Bug: 398776229
Bug: 365884835
Test: CtsWindowManagerDeviceAnimations:ActivityTransitionTests
Test: SurfaceAnimationRunnerTest
Test: AnimatingActivityRegistryTest PendingRemoteAnimationRegistryTest
Flag: EXEMPT removing unused code
Change-Id: I06cc92f398005d6cd6a6037b079a04f61deb2676
2 files changed