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

extensions/browser/api/alarms/alarms_api_unittest.cc

Index: extensions/browser/api/alarms/alarms_api_unittest.cc
diff --git a/extensions/browser/api/alarms/alarms_api_unittest.cc b/extensions/browser/api/alarms/alarms_api_unittest.cc
index 20ef94d2b831b0cbb62dff28dd1bbc400c58e22e..dfaac4a4d423007f8821b8ec99d83f688709a00d 100644
--- a/extensions/browser/api/alarms/alarms_api_unittest.cc
+++ b/extensions/browser/api/alarms/alarms_api_unittest.cc
@@ -7,6 +7,7 @@
 #include <stddef.h>
 
 #include "base/json/json_reader.h"
+#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/test/simple_test_clock.h"
 #include "base/values.h"
@@ -36,7 +37,7 @@ class AlarmDelegate : public AlarmManager::Delegate {
   ~AlarmDelegate() override {}
   void OnAlarm(const std::string& extension_id, const Alarm& alarm) override {
     alarms_seen.push_back(alarm.js_alarm->name);
-    if (base::MessageLoop::current()->is_running())
+    if (base::RunLoop::IsRunningOnCurrentThread())
       base::MessageLoop::current()->QuitWhenIdle();
   }