Make nesting/running states a RunLoop rather than a MessageLoop concept.

mash/quick_launch/quick_launch.cc

 // Copyright 2016 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 "mash/quick_launch/quick_launch.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mash/public/interfaces/launchable.mojom.h"
 #include "services/catalog/public/interfaces/catalog.mojom.h"
 #include "services/catalog/public/interfaces/constants.mojom.h"
 #include "services/service_manager/public/c/main.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/interface_registry.h"
 #include "services/service_manager/public/cpp/service.h"
@@ skipping 139 matching lines @@
 
 QuickLaunch::~QuickLaunch() {
   while (!windows_.empty())
     windows_.front()->CloseNow();
 }
 
 void QuickLaunch::RemoveWindow(views::Widget* window) {
   auto it = std::find(windows_.begin(), windows_.end(), window);
   DCHECK(it != windows_.end());
   windows_.erase(it);
-  if (windows_.empty() && base::MessageLoop::current()->is_running())
+  if (windows_.empty() && base::RunLoop::IsRunningOnCurrentThread())
     base::MessageLoop::current()->QuitWhenIdle();
 }
 
 void QuickLaunch::OnStart() {
   tracing_.Initialize(context()->connector(), context()->identity().name());
 
   aura_init_ = base::MakeUnique<views::AuraInit>(
       context()->connector(), context()->identity(), "views_mus_resources.pak",
       std::string(), nullptr, views::AuraInit::Mode::AURA_MUS);
 
@@ skipping 26 matching lines @@
   windows_.push_back(window);
 }
 
 void QuickLaunch::Create(const service_manager::Identity& remote_identity,
                          ::mash::mojom::LaunchableRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace quick_launch
 }  // namespace mash