Remove unnecessary RTPFragmentationHeader from VideoProcessor callbacks.

This test is and should be independent of RTP, so we don't need the
information provided in this struct.

BUG=webrtc:6634

Review-Url: https://codereview.webrtc.org/2995403002
Cr-Original-Commit-Position: refs/heads/master@{#19443}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4553562fe3be5e61ebde13dd2c0850cbce49d052
2 files changed