Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/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.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 270 matching lines @@
       testonly = true
 
       # Only the root target should depend on this.
       visibility = [ "//:default" ]
 
       deps = [
         ":rtc_unittests",
         ":video_engine_tests",
         ":webrtc_nonparallel_tests",
         ":webrtc_perf_tests",
-        "api:peerconnection_unittests",
         "common_audio:common_audio_unittests",
         "common_video:common_video_unittests",
         "libjingle:xmllite_xmpp_unittests",
         "media:rtc_media_unittests",
         "modules:modules_tests",
         "modules:modules_unittests",
         "modules/audio_coding:audio_coding_tests",
         "modules/audio_processing:audio_processing_tests",
         "modules/rtp_rtcp:test_packet_masks_metrics",
         "modules/video_capture:video_capture_internal_impl",
+        "pc:peerconnection_unittests",
         "pc:rtc_pc_unittests",
         "stats:rtc_stats_unittests",
         "system_wrappers:system_wrappers_unittests",
         "test",
         "video:screenshare_loopback",
         "video:video_loopback",
         "video:video_tests",
         "voice_engine:voe_cmd_test",
         "voice_engine:voice_engine_unittests",
       ]
@@ skipping 404 matching lines @@
       ]
 
       deps = [
         "//base:base_java_test_support",
         "//webrtc/examples:AppRTCMobile_javalib",
         "//webrtc/sdk/android:libjingle_peerconnection_java",
       ]
     }
   }
 }