Revert 179189

base/message_loop.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 "base/message_loop.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 233 matching lines @@
   // DCHECK(loop) << "Ouch, did you forget to initialize me?";
   return lazy_tls_ptr.Pointer()->Get();
 }
 
 // static
 void MessageLoop::EnableHistogrammer(bool enable) {
   enable_histogrammer_ = enable;
 }
 
 // static
-bool MessageLoop::InitMessagePumpForUIFactory(MessagePumpFactory* factory) {
-  if (message_pump_for_ui_factory_)
-    return false;
-
+void MessageLoop::InitMessagePumpForUIFactory(MessagePumpFactory* factory) {
+  DCHECK(!message_pump_for_ui_factory_);
   message_pump_for_ui_factory_ = factory;
-  return true;
 }
 
 void MessageLoop::AddDestructionObserver(
     DestructionObserver* destruction_observer) {
   DCHECK_EQ(this, current());
   destruction_observers_.AddObserver(destruction_observer);
 }
 
 void MessageLoop::RemoveDestructionObserver(
     DestructionObserver* destruction_observer) {
@@ skipping 536 matching lines @@
                                            Watcher *delegate) {
   return pump_libevent()->WatchFileDescriptor(
       fd,
       persistent,
       mode,
       controller,
       delegate);
 }
 
 #endif