Rewrite PeerConnection integration tests using better testing practices.

webrtc/pc/test/mockpeerconnectionobservers.h

 /*
  *  Copyright 2012 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 21 matching lines @@
     called_ = true;
     result_ = true;
     desc_.reset(desc);
   }
   virtual void OnFailure(const std::string& error) {
     called_ = true;
     result_ = false;
   }
   bool called() const { return called_; }
   bool result() const { return result_; }
-  SessionDescriptionInterface* release_desc() {
-    return desc_.release();
+  std::unique_ptr<SessionDescriptionInterface> MoveDescription() {
+    return std::move(desc_);
   }
 
  private:
   bool called_;
   bool result_;
   std::unique_ptr<SessionDescriptionInterface> desc_;
 };
 
 class MockSetSessionDescriptionObserver
     : public webrtc::SetSessionDescriptionObserver {
@@ skipping 167 matching lines @@
     int bytes_sent;
     int available_receive_bandwidth;
     std::string dtls_cipher;
     std::string srtp_cipher;
   } stats_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_PC_TEST_MOCKPEERCONNECTIONOBSERVERS_H_