Reland https://codereview.chromium.org/1271593002/ which was reverted

net/url_request/url_request_http_job_unittest.cc

 // Copyright (c) 2013 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/url_request/url_request_http_job.h"
 
 #include <cstddef>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 373 matching lines @@
       new TestURLRequestHttpJob(req_.get()));
   job->SetPriority(LOW);
   job->Start();
   ASSERT_TRUE(network_layer_.last_transaction());
   EXPECT_EQ(LOW, network_layer_.last_transaction()->priority());
 
   job->SetPriority(HIGHEST);
   EXPECT_EQ(HIGHEST, network_layer_.last_transaction()->priority());
 }
 
-// Make sure that URLRequestHttpJob passes on its priority updates to
-// newly-created transactions after the first one.
-TEST_F(URLRequestHttpJobTest, SetSubsequentTransactionPriority) {
-  scoped_refptr<TestURLRequestHttpJob> job(
-      new TestURLRequestHttpJob(req_.get()));
-  job->Start();
-
-  job->SetPriority(LOW);
-  ASSERT_TRUE(network_layer_.last_transaction());
-  EXPECT_EQ(LOW, network_layer_.last_transaction()->priority());
-
-  job->Kill();
-  network_layer_.ClearLastTransaction();
-
-  // Creates a second transaction.
-  job->Start();
-  ASSERT_TRUE(network_layer_.last_transaction());
-  EXPECT_EQ(LOW, network_layer_.last_transaction()->priority());
-}
-
 // Confirm we do advertise SDCH encoding in the case of a GET.
 TEST_F(URLRequestHttpJobTest, SdchAdvertisementGet) {
   EnableSdch();
   req_->set_method("GET");  // Redundant with default.
   scoped_refptr<TestURLRequestHttpJob> job(
       new TestURLRequestHttpJob(req_.get()));
   job->Start();
   EXPECT_TRUE(TransactionAcceptsSdchEncoding());
 }
 
@@ skipping 168 matching lines @@
   req_->SetLoadFlags(LOAD_DISABLE_CACHE);
   job->Start();
   base::RunLoop().RunUntilIdle();
   EXPECT_EQ(URLRequestStatus::IO_PENDING, req_->status().status());
   EXPECT_TRUE(fake_handshake_stream->initialize_stream_was_called());
 }
 
 }  // namespace
 
 }  // namespace net