Add CHECK to catch places where BrowserProcessImpl's refcount goes to 0.

base/message_loop.cc

 // Copyright (c) 2011 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 "base/message_loop.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 390 matching lines @@
   DCHECK_EQ(this, current());
   task_observers_.RemoveObserver(task_observer);
 }
 
 void MessageLoop::AssertIdle() const {
   // We only check |incoming_queue_|, since we don't want to lock |work_queue_|.
   base::AutoLock lock(incoming_queue_lock_);
   DCHECK(incoming_queue_.empty());
 }
 
+bool MessageLoop::is_running() const {
+  DCHECK_EQ(this, current());
+  return state_ != NULL;
+}
+
 //------------------------------------------------------------------------------
 
 // Runs the loop in two different SEH modes:
 // enable_SEH_restoration_ = false : any unhandled exception goes to the last
 // one that calls SetUnhandledExceptionFilter().
 // enable_SEH_restoration_ = true : any unhandled exception goes to the filter
 // that was existed before the loop was run.
 void MessageLoop::RunHandler() {
 #if defined(OS_WIN)
   if (exception_restoration_) {
@@ skipping 450 matching lines @@
                                            Watcher *delegate) {
   return pump_libevent()->WatchFileDescriptor(
       fd,
       persistent,
       static_cast<base::MessagePumpLibevent::Mode>(mode),
       controller,
       delegate);
 }
 
 #endif