Move RtpExtension to api/ directory and config.h/.cc to call/.

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")
 
@@ skipping 323 matching lines @@
       "test/testAPI/test_api_audio.cc",
       "test/testAPI/test_api_rtcp.cc",
       "test/testAPI/test_api_video.cc",
     ]
     deps = [
       ":fec_test_helper",
       ":mock_rtp_rtcp",
       ":rtp_rtcp",
       "..:module_api",
       "../..:webrtc_common",
+      "../../api:libjingle_peerconnection_api",
       "../../api:transport_api",
       "../../common_video:common_video",
       "../../rtc_base:rtc_base_approved",
       "../../system_wrappers:system_wrappers",
       "../../test:field_trial",
       "../../test:rtp_test_utils",
       "../../test:test_common",
       "../../test:test_support",
       "//testing/gmock",
     ]
 
     # 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" ]
     }
   }
 }