Move RTP for synchroninzation and rename classes, files and variables.

webrtc/video/BUILD.gn

Index: webrtc/video/BUILD.gn
diff --git a/webrtc/video/BUILD.gn b/webrtc/video/BUILD.gn
index 1f116bf2398d4a06af4090b4c7439b3d40995d49..84cab2680a98aa8046e073a24b3eb32fca5130cf 100644
--- a/webrtc/video/BUILD.gn
+++ b/webrtc/video/BUILD.gn
@@ -25,6 +25,8 @@ source_set("video") {
     "report_block_stats.h",
     "rtp_stream_receiver.cc",
     "rtp_stream_receiver.h",
+    "rtp_streams_synchronizer.cc",
+    "rtp_streams_synchronizer.h",
     "send_delay_stats.cc",
     "send_delay_stats.h",
     "send_statistics_proxy.cc",
@@ -47,8 +49,6 @@ source_set("video") {
     "vie_encoder.h",
     "vie_remb.cc",
     "vie_remb.h",
-    "vie_sync_module.cc",
-    "vie_sync_module.h",
   ]
 
   configs += [ "..:common_config" ]