GN: Refactor modules_unittests to eliminate package boundary violations.

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("../../build/webrtc.gni")
 
@@ skipping 193 matching lines @@
       "test/testFec/test_packet_masks_metrics.cc",
     ]
 
     deps = [
       ":rtp_rtcp",
       "//testing/gtest",
       "//webrtc/test:test_main",
     ]
   }  # test_packet_masks_metrics
 
+  rtc_source_set("rtp_rtcp_modules_tests") {
+    testonly = true
+    sources = [
+      "test/testFec/test_fec.cc",
+    ]
+    deps = [
+      ":rtp_rtcp",
+      "../../base:rtc_base_approved",
+      "../../test:test_support",
+    ]
+    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" ]
+    }
+  }
+
   rtc_source_set("rtp_rtcp_unittests") {
     testonly = true
     sources = [
       "mocks/mock_rtp_rtcp.h",
       "source/byte_io_unittest.cc",
       "source/fec_test_helper.cc",
       "source/fec_test_helper.h",
       "source/flexfec_header_reader_writer_unittest.cc",
       "source/flexfec_receiver_unittest.cc",
       "source/flexfec_sender_unittest.cc",
@@ skipping 69 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" ]
     }
   }
 }