Remove calls to deprecated MessageLoop methods in base.

base/test/power_monitor_test_base.cc

Index: base/test/power_monitor_test_base.cc
diff --git a/base/test/power_monitor_test_base.cc b/base/test/power_monitor_test_base.cc
index 73438ea3e94958585642afcd645b8293b2c1c705..8e8b9124b018bae57c5933594e3b929646cfa8ac 100644
--- a/base/test/power_monitor_test_base.cc
+++ b/base/test/power_monitor_test_base.cc
@@ -7,6 +7,7 @@
 #include "base/message_loop/message_loop.h"
 #include "base/power_monitor/power_monitor.h"
 #include "base/power_monitor/power_monitor_source.h"
+#include "base/run_loop.h"
 
 namespace base {
 
@@ -20,17 +21,17 @@ PowerMonitorTestSource::~PowerMonitorTestSource() {
 void PowerMonitorTestSource::GeneratePowerStateEvent(bool on_battery_power) {
   test_on_battery_power_ = on_battery_power;
   ProcessPowerEvent(POWER_STATE_EVENT);
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
 }
 
 void PowerMonitorTestSource::GenerateSuspendEvent() {
   ProcessPowerEvent(SUSPEND_EVENT);
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
 }
 
 void PowerMonitorTestSource::GenerateResumeEvent() {
   ProcessPowerEvent(RESUME_EVENT);
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
 }
 
 bool PowerMonitorTestSource::IsOnBatteryPowerImpl() {