Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/pc/proxy_unittest.cc

 /*
  *  Copyright 2013 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.
  */
 
@@ skipping 219 matching lines @@
   const std::string arg1 = "arg1";
   const std::string arg2 = "arg2";
   EXPECT_CALL(*fake_, Method2(arg1, arg2))
       .Times(Exactly(1))
       .WillOnce(DoAll(InvokeWithoutArgs(this, &ProxyTest::CheckWorkerThread),
                       Return("Method2")));
   EXPECT_EQ("Method2", fake_proxy_->Method2(arg1, arg2));
 }
 
 }  // namespace webrtc