Break rtp_rtcp_format out of rtp_rtcp, to resolve circular dependencies

webrtc/modules/rtp_rtcp/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../../webrtc.gni")
 
+rtc_source_set("rtp_rtcp_format") {
+  sources = [
+    "include/rtp_cvo.h",
+    "include/rtp_header_extension_map.h",
+    "include/rtp_rtcp_defines.h",
+    "source/byte_io.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",
+  ]
+
+  deps = [
+    "..:module_api",
+    "../..:webrtc_common",
+    "../../api:array_view",
+    "../../api:libjingle_peerconnection_api",
+    "../../api:optional",
+    "../../common_video",
+    "../../rtc_base:rtc_base_approved",
+    "../../system_wrappers",
+  ]
+
+  # TODO(crbug.com/webrtc/1348): Fix this warning.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+}
+
 rtc_static_library("rtp_rtcp") {
   sources = [
     "include/flexfec_receiver.h",
     "include/flexfec_sender.h",
     "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",
     "source/dtmf_queue.h",
     "source/fec_private_tables_bursty.h",
     "source/fec_private_tables_random.h",
     "source/flexfec_header_reader_writer.cc",
     "source/flexfec_header_reader_writer.h",
     "source/flexfec_receiver.cc",
     "source/flexfec_sender.cc",
     "source/forward_error_correction.cc",
     "source/forward_error_correction.h",
@@ skipping 67 matching lines @@
     "source/rtp_format.cc",
     "source/rtp_format.h",
     "source/rtp_format_h264.cc",
     "source/rtp_format_h264.h",
     "source/rtp_format_video_generic.cc",
     "source/rtp_format_video_generic.h",
     "source/rtp_format_vp8.cc",
     "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",
     "source/rtp_receiver_impl.cc",
     "source/rtp_receiver_impl.h",
     "source/rtp_receiver_strategy.cc",
     "source/rtp_receiver_strategy.h",
     "source/rtp_receiver_video.cc",
     "source/rtp_receiver_video.h",
     "source/rtp_rtcp_config.h",
@@ skipping 42 matching lines @@
     "../../common_video",
     "../../logging:rtc_event_log_api",
     "../../rtc_base:gtest_prod",
     "../../rtc_base:rtc_base_approved",
     "../../rtc_base:sequenced_task_checker",
     "../../system_wrappers",
     "../audio_coding:audio_format_conversion",
     "../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" ]
 
   if (is_win) {
     cflags = [
       # TODO(kjellander): Bug 261: fix this warning.
       "/wd4373",  # virtual function override.
     ]
   }
 }
@@ skipping 163 matching lines @@
     ]
 
     # TODO(jschuh): bugs.webrtc.org/1348: fix this warning.
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }