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

device/bluetooth/bluez/bluetooth_adapter_profile_bluez_unittest.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 "device/bluetooth/bluez/bluetooth_adapter_profile_bluez.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/run_loop.h"
@@ skipping 60 matching lines @@
   }
 
   void TearDown() override {
     profile_.reset();
     adapter_ = nullptr;
     bluez::BluezDBusManager::Shutdown();
   }
 
   void AdapterCallback(scoped_refptr<BluetoothAdapter> adapter) {
     adapter_ = adapter;
-    if (base::MessageLoop::current() &&
-        base::MessageLoop::current()->is_running()) {
+    if (base::RunLoop::IsRunningOnCurrentThread())
       base::MessageLoop::current()->QuitWhenIdle();
-    }
   }
 
   class FakeDelegate : public bluez::BluetoothProfileServiceProvider::Delegate {
    public:
     FakeDelegate(const std::string& device_path) : connections_(0) {
       device_path_ = dbus::ObjectPath(device_path);
     }
 
     // bluez::BluetoothProfileServiceProvider::Delegate:
     void Released() override {
@@ skipping 286 matching lines @@
                  base::Unretained(this)));
 
   base::RunLoop().RunUntilIdle();
 
   EXPECT_FALSE(profile_user_ptr_);
   EXPECT_EQ(0U, success_callback_count_);
   EXPECT_EQ(2U, error_callback_count_);
 }
 
 }  // namespace bluez