Break rtp_rtcp_format out of rtp_rtcp, to resolve circular dependencies with RtcEventLog

webrtc/modules/rtp_rtcp/BUILD.gn

Index: webrtc/modules/rtp_rtcp/BUILD.gn
diff --git a/webrtc/modules/rtp_rtcp/BUILD.gn b/webrtc/modules/rtp_rtcp/BUILD.gn
index a5b0d300b6564c3a977c6bea297d61fb5f4f6078..f787e26e52c4baf06e987c0aafe0614d17648650 100644
--- a/webrtc/modules/rtp_rtcp/BUILD.gn
+++ b/webrtc/modules/rtp_rtcp/BUILD.gn
@@ -8,6 +8,27 @@
 
 import("../../webrtc.gni")
 
+rtc_static_library("rtp_rtcp_format") {
+  sources = [
+    "include/rtp_header_extension_map.h",
+    "include/rtp_rtcp_defines.h",
+    "source/rtp_header_extension_map.cc",
+    "source/rtp_header_extensions.cc",
+    "source/rtp_header_extensions.h",
+    "source/rtp_packet.cc",
+    "source/rtp_packet.h",
+    "source/rtp_packet_received.cc",
+    "source/rtp_packet_received.h",
+    "source/rtp_packet_to_send.h",
+    "source/rtp_utility.cc",
+    "source/rtp_utility.h",
+  ]
+
+  deps = [
+    "../../rtc_base:rtc_base_approved",
+  ]
+}
+
 rtc_static_library("rtp_rtcp") {
   sources = [
     "include/flexfec_receiver.h",
@@ -15,12 +36,10 @@ rtc_static_library("rtp_rtcp") {
     "include/receive_statistics.h",
     "include/remote_ntp_time_estimator.h",
     "include/rtp_cvo.h",
-    "include/rtp_header_extension_map.h",
     "include/rtp_header_parser.h",
     "include/rtp_payload_registry.h",
     "include/rtp_receiver.h",
     "include/rtp_rtcp.h",
-    "include/rtp_rtcp_defines.h",
     "include/ulpfec_receiver.h",
     "source/byte_io.h",
     "source/dtmf_queue.cc",
@@ -110,17 +129,9 @@ rtc_static_library("rtp_rtcp") {
     "source/rtp_format_vp8.h",
     "source/rtp_format_vp9.cc",
     "source/rtp_format_vp9.h",
-    "source/rtp_header_extension_map.cc",
-    "source/rtp_header_extensions.cc",
-    "source/rtp_header_extensions.h",
     "source/rtp_header_parser.cc",
-    "source/rtp_packet.cc",
-    "source/rtp_packet.h",
     "source/rtp_packet_history.cc",
     "source/rtp_packet_history.h",
-    "source/rtp_packet_received.cc",
-    "source/rtp_packet_received.h",
-    "source/rtp_packet_to_send.h",
     "source/rtp_payload_registry.cc",
     "source/rtp_receiver_audio.cc",
     "source/rtp_receiver_audio.h",
@@ -139,8 +150,6 @@ rtc_static_library("rtp_rtcp") {
     "source/rtp_sender_audio.h",
     "source/rtp_sender_video.cc",
     "source/rtp_sender_video.h",
-    "source/rtp_utility.cc",
-    "source/rtp_utility.h",
     "source/time_util.cc",
     "source/time_util.h",
     "source/tmmbr_help.cc",
@@ -183,6 +192,10 @@ rtc_static_library("rtp_rtcp") {
     "../remote_bitrate_estimator",
   ]
 
+  public_deps = [
+    ":rtp_rtcp_format",
+  ]
+
   # TODO(jschuh): Bug 1348: fix this warning.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]