Fix purify freeze. Revert "Use a priority queue to assure that subresources are resolved asap"

chrome/browser/net/dns_host_info_unittest.cc

 // Copyright (c) 2006-2008 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.
 
 // Single threaded tests of DnsHostInfo functionality.
 
 #include <time.h>
 #include <string>
 
 #include "base/platform_thread.h"
@@ skipping 64 matching lines @@
   // We're assuming the caching just started with our lookup.
   PlatformThread::Sleep(80);  // Not enough time to pass our 300ms mark.
   EXPECT_FALSE(info.NeedsDnsUpdate(hostname1)) << "expiration time not honored";
   // Still not past our 300ms mark (only about 4+2ms)
   PlatformThread::Sleep(80);
   EXPECT_FALSE(info.NeedsDnsUpdate(hostname1)) << "expiration time not honored";
   PlatformThread::Sleep(150);
   EXPECT_TRUE(info.NeedsDnsUpdate(hostname1)) << "expiration time not honored";
 }
 
-// When a system gets "congested" relative to DNS, it means it is doing too many
-// DNS resolutions, and bogging down the system.  When we detect such a
-// situation, we divert the sequence of states a DnsHostInfo instance moves
-// through.  Rather than proceeding from QUEUED (waiting in a name queue for a
-// worker thread that can resolve the name) to ASSIGNED (where a worker thread
-// actively resolves the name), we enter the ASSIGNED state (without actually
-// getting sent to a resolver thread) and reset our state to what it was before
-// the corresponding name was put in the work_queue_.  This test drives through
-// the state transitions used in such congestion handling.
-TEST(DnsHostInfoTest, CongestionResetStateTest) {
-  DnsHostInfo info;
-  std::string hostname1("domain1.com");
-
-  info.SetHostname(hostname1);
-  info.SetQueuedState(DnsHostInfo::UNIT_TEST_MOTIVATED);
-  info.SetAssignedState();
-  EXPECT_TRUE(info.is_assigned());
-
-  info.RemoveFromQueue();  // Do the reset.
-  EXPECT_FALSE(info.is_assigned());
-
-  // Since this was a new info instance, and it never got resolved, we land back
-  // in a PENDING state rather than FOUND or NO_SUCH_NAME.
-  EXPECT_FALSE(info.was_found());
-  EXPECT_FALSE(info.was_nonexistant());
-
-  // Make sure we're completely re-usable, by going throug a normal flow.
-  info.SetQueuedState(DnsHostInfo::UNIT_TEST_MOTIVATED);
-  info.SetAssignedState();
-  info.SetFoundState();
-  EXPECT_TRUE(info.was_found());
-
-  // Use the congestion flow, and check that we end up in the found state.
-  info.SetQueuedState(DnsHostInfo::UNIT_TEST_MOTIVATED);
-  info.SetAssignedState();
-  info.RemoveFromQueue();  // Do the reset.
-  EXPECT_FALSE(info.is_assigned());
-  EXPECT_TRUE(info.was_found());  // Back to what it was before being queued.
-}
-
-
 // TODO(jar): Add death test for illegal state changes, and also for setting
 // hostname when already set.
 
 }  // namespace