Add MockFrameTransformer to test/, and remove definitions from unit test files. Bug: webrtc:11380 Change-Id: Ia709883e8d000852e3f71e7bfb87877072e22aeb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/174001 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Marina Ciocea <marinaciocea@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31151}