Fix some potential after free errors on TestCompletionCallback

net/http/http_cache_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_cache.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop.h"
@@ skipping 5917 matching lines @@
   EXPECT_FALSE(cache.network_layer()->last_transaction());
   EXPECT_EQ(net::DEFAULT_PRIORITY,
             cache.network_layer()->last_create_transaction_priority());
 
   net::HttpRequestInfo info;
   info.url = GURL(kSimpleGET_Transaction.url);
   net::TestCompletionCallback callback;
   EXPECT_EQ(net::ERR_IO_PENDING,
             trans->Start(&info, callback.callback(), net::BoundNetLog()));
 
-  ASSERT_TRUE(cache.network_layer()->last_transaction());
-  EXPECT_EQ(net::LOW,
-            cache.network_layer()->last_create_transaction_priority());
-  EXPECT_EQ(net::LOW,
-            cache.network_layer()->last_transaction()->priority());
+  EXPECT_TRUE(cache.network_layer()->last_transaction());
+  if (cache.network_layer()->last_transaction()) {
+    EXPECT_EQ(net::LOW,
+              cache.network_layer()->last_create_transaction_priority());
+    EXPECT_EQ(net::LOW,
+              cache.network_layer()->last_transaction()->priority());
+  }
 
   trans->SetPriority(net::HIGHEST);
-  EXPECT_EQ(net::LOW,
-            cache.network_layer()->last_create_transaction_priority());
-  EXPECT_EQ(net::HIGHEST,
-            cache.network_layer()->last_transaction()->priority());
+
+  if (cache.network_layer()->last_transaction()) {
+    EXPECT_EQ(net::LOW,
+              cache.network_layer()->last_create_transaction_priority());
+    EXPECT_EQ(net::HIGHEST,
+              cache.network_layer()->last_transaction()->priority());
+  }
 
   EXPECT_EQ(net::OK, callback.WaitForResult());
 }
 
 // Make sure that a cache transaction passes on its priority to
 // newly-created network transactions.
 TEST(HttpCache, SetPriorityNewTransaction) {
   MockHttpCache cache;
   AddMockTransaction(&kRangeGET_TransactionOK);
 
@@ skipping 30 matching lines @@
   trans->SetPriority(net::HIGHEST);
   // Should trigger a new network transaction and pick up the new
   // priority.
   ReadAndVerifyTransaction(trans.get(), transaction);
 
   EXPECT_EQ(net::HIGHEST,
             cache.network_layer()->last_create_transaction_priority());
 
   RemoveMockTransaction(&kRangeGET_TransactionOK);
 }