Rename PlayoutDelay --> VideoPlayoutDelay, move to api/video/video_timing.h

We can then finally delete the top-level common_types.h, and the
corresponding build target webrtc_common.

Bug: webrtc:7660
Change-Id: I1c1096541477586d90774c7a3405b9d36edec14a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/182800
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32044}
diff --git a/modules/video_coding/frame_buffer2_unittest.cc b/modules/video_coding/frame_buffer2_unittest.cc
index 2de3f33..c05fe08 100644
--- a/modules/video_coding/frame_buffer2_unittest.cc
+++ b/modules/video_coding/frame_buffer2_unittest.cc
@@ -280,7 +280,7 @@
   VCMTiming timing(time_controller_.GetClock());
   buffer_.reset(
       new FrameBuffer(time_controller_.GetClock(), &timing, &stats_callback_));
-  const PlayoutDelay kPlayoutDelayMs = {0, 0};
+  const VideoPlayoutDelay kPlayoutDelayMs = {0, 0};
   std::unique_ptr<FrameObjectFake> test_frame(new FrameObjectFake());
   test_frame->id.picture_id = 0;
   test_frame->SetPlayoutDelay(kPlayoutDelayMs);