Instrument SdchOwner for clock nullification.

net/base/sdch_manager.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/base/sdch_manager.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 241 matching lines @@
 SdchManager::SdchManager() {
   DCHECK(thread_checker_.CalledOnValidThread());
 }
 
 SdchManager::~SdchManager() {
   DCHECK(thread_checker_.CalledOnValidThread());
   while (!dictionaries_.empty()) {
     auto it = dictionaries_.begin();
     dictionaries_.erase(it->first);
   }
+#if defined(OS_CHROMEOS)
+  // For debugging http://crbug.com/454198; remove when resolved.
+
+  // Explicitly confirm that we can't notify any observers anymore.
+  CHECK(!observers_.might_have_observers());
+#endif
 }
 
 void SdchManager::ClearData() {
   blacklisted_domains_.clear();
   allow_latency_experiment_.clear();
   dictionaries_.clear();
   FOR_EACH_OBSERVER(SdchObserver, observers_, OnClearDictionaries(this));
 }
 
 // static
@@ skipping 394 matching lines @@
       entry_dict->SetInteger("tries", it->second.count);
     entry_dict->SetInteger("reason", it->second.reason);
     entry_list->Append(entry_dict);
   }
   value->Set("blacklisted", entry_list);
 
   return value;
 }
 
 }  // namespace net