Make sure we process all pending offer/answer requests before terminating.

talk/app/webrtc/dtlsidentitystore_unittest.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 15 matching lines @@
  */
 
 #include "talk/app/webrtc/dtlsidentitystore.h"
 
 #include "talk/app/webrtc/webrtcsessiondescriptionfactory.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/ssladapter.h"
 
 using webrtc::DtlsIdentityStore;
-using webrtc::WebRtcSessionDescriptionFactory;
 
 static const int kTimeoutMs = 10000;
 
 class MockDtlsIdentityRequestObserver :
     public webrtc::DTLSIdentityRequestObserver {
  public:
   MockDtlsIdentityRequestObserver()
       : call_back_called_(false), last_request_success_(false) {}
   void OnFailure(int error) override {
     EXPECT_FALSE(call_back_called_);
@@ skipping 74 matching lines @@
 TEST_F(DtlsIdentityStoreTest, DeleteStoreEarlyNoCrash) {
   EXPECT_FALSE(store_->HasFreeIdentityForTesting());
 
   store_->RequestIdentity(observer_.get());
   store_.reset();
 
   worker_thread_->Stop();
   EXPECT_FALSE(observer_->call_back_called());
 }