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

device/bluetooth/test/test_bluetooth_adapter_observer.cc

Index: device/bluetooth/test/test_bluetooth_adapter_observer.cc
diff --git a/device/bluetooth/test/test_bluetooth_adapter_observer.cc b/device/bluetooth/test/test_bluetooth_adapter_observer.cc
index 1ab083060d2bc1f54493d8542a476a13c38d5af4..ed01c5093a9bccf7873bce559ce333f2135e3259 100644
--- a/device/bluetooth/test/test_bluetooth_adapter_observer.cc
+++ b/device/bluetooth/test/test_bluetooth_adapter_observer.cc
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic.h"
 #include "device/bluetooth/bluetooth_remote_gatt_descriptor.h"
 #include "device/bluetooth/bluetooth_remote_gatt_service.h"
@@ -333,8 +334,7 @@ void TestBluetoothAdapterObserver::GattDescriptorValueChanged(
 }
 
 void TestBluetoothAdapterObserver::QuitMessageLoop() {
-  if (base::MessageLoop::current() &&
-      base::MessageLoop::current()->is_running())
+  if (base::RunLoop::IsRunningOnCurrentThread())
     base::MessageLoop::current()->QuitWhenIdle();
 }