Migrate WebRTC on FrameGeneratorInterface and remove FrameGenerator class

Bug: webrtc:10138
Change-Id: If85290581a72f81cf60181de7a7134cc9db7716e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161327
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30033}
diff --git a/rtc_tools/BUILD.gn b/rtc_tools/BUILD.gn
index de5b909..00528a4 100644
--- a/rtc_tools/BUILD.gn
+++ b/rtc_tools/BUILD.gn
@@ -153,6 +153,7 @@
     ]
 
     deps = [
+      "../api:create_frame_generator",
       "../api:rtp_parameters",
       "../api:transport_api",
       "../api/rtc_event_log",