Fix a crash when running with --memory-metrics on Android.

content/browser/browser_main_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 "content/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/hi_res_timer_manager.h"
@@ skipping 383 matching lines @@
 
 #if defined(OS_ANDROID)
   SurfaceTexturePeer::InitInstance(new SurfaceTexturePeerBrowserImpl(
       parameters_.command_line.HasSwitch(
           switches::kMediaPlayerInRenderProcess)));
   DataFetcherImplAndroid::Init(base::android::AttachCurrentThread());
 #endif
 
   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
     memory_observer_.reset(new MemoryObserver());
-    main_message_loop_->AddTaskObserver(memory_observer_.get());
+    MessageLoop::current()->AddTaskObserver(memory_observer_.get());
   }
 }
 
 void BrowserMainLoop::CreateThreads() {
   if (parts_.get())
     result_code_ = parts_->PreCreateThreads();
 
 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
   // Single-process is an unsupported and not fully tested mode, so
   // don't enable it for official Chrome builds (except on Android).
@@ skipping 390 matching lines @@
   DCHECK_EQ(MessageLoop::TYPE_UI, MessageLoop::current()->type());
   if (parameters_.ui_task)
     MessageLoopForUI::current()->PostTask(FROM_HERE, *parameters_.ui_task);
 
   base::RunLoop run_loop;
   run_loop.Run();
 #endif
 }
 
 }  // namespace content