Call MessageFilter clean up handlers even for pending filters

content/browser/memory/memory_pressure_controller_impl.cc

 // Copyright 2015 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 "content/browser/memory/memory_pressure_controller_impl.h"
 
 #include "base/bind.h"
 #include "content/browser/memory/memory_message_filter.h"
 #include "content/public/browser/browser_thread.h"
 
@@ skipping 21 matching lines @@
     filter->SendSetPressureNotificationsSuppressed(true);
 }
 
 void MemoryPressureControllerImpl::OnMemoryMessageFilterRemoved(
     MemoryMessageFilter* filter) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   // Remove the message filter from the set of all memory message filters,
   // ensuring that it was there beforehand.
   auto it = memory_message_filters_.find(filter->process_host());
-  DCHECK(it != memory_message_filters_.end());
+  if (it == memory_message_filters_.end())
+    return;
   DCHECK_EQ(filter, it->second);
   memory_message_filters_.erase(it);
 }
 
 // static
 MemoryPressureControllerImpl* MemoryPressureControllerImpl::GetInstance() {
   return base::Singleton<
       MemoryPressureControllerImpl,
       base::LeakySingletonTraits<MemoryPressureControllerImpl>>::get();
 }
@@ skipping 73 matching lines @@
   if (base::MemoryPressureListener::AreNotificationsSuppressed())
     return;
 
   // Find the appropriate message filter and dispatch the message.
   auto it = memory_message_filters_.find(child_process_host);
   if (it != memory_message_filters_.end())
     it->second->SendPressureNotification(level);
 }
 
 }  // namespace content