Attempting to resolve a race condition with PowerMonitor

content/child/power_monitor_broadcast_source_unittest.cc

 // Copyright 2013 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 "base/message_loop/message_loop.h"
 #include "base/test/power_monitor_test_base.h"
 #include "content/child/power_monitor_broadcast_source.h"
 #include "content/common/power_monitor_messages.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
 class PowerMonitorBroadcastSourceTest : public testing::Test {
  protected:
   PowerMonitorBroadcastSourceTest() {
     power_monitor_source_ = new PowerMonitorBroadcastSource();
-    power_monitor_.reset(new base::PowerMonitor(
-        scoped_ptr<base::PowerMonitorSource>(power_monitor_source_)));
+    base::PowerMonitor::Initialize(
+        scoped_ptr<base::PowerMonitorSource>(power_monitor_source_));
   }
-  virtual ~PowerMonitorBroadcastSourceTest() {}
+  virtual ~PowerMonitorBroadcastSourceTest() {
+    base::PowerMonitor::ShutdownForTesting();
+  }
 
   PowerMonitorBroadcastSource* source() { return power_monitor_source_; }
-  base::PowerMonitor* monitor() { return power_monitor_.get(); }
 
   base::MessageLoop message_loop_;
 
  private:
   PowerMonitorBroadcastSource* power_monitor_source_;
-  scoped_ptr<base::PowerMonitor> power_monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerMonitorBroadcastSourceTest);
 };
 
 TEST_F(PowerMonitorBroadcastSourceTest, PowerMessageReceiveBroadcast) {
   IPC::ChannelProxy::MessageFilter* message_filter =
     source()->GetMessageFilter();
 
   base::PowerMonitorTestObserver observer;
-  monitor()->AddObserver(&observer);
+  base::PowerMonitor::AddObserver(&observer);
 
   PowerMonitorMsg_Suspend suspend_msg;
   PowerMonitorMsg_Resume resume_msg;
 
   // Sending resume when not suspended should have no effect.
   message_filter->OnMessageReceived(resume_msg);
   message_loop_.RunUntilIdle();
   EXPECT_EQ(observer.resumes(), 0);
 
   // Pretend we suspended.
@@ skipping 36 matching lines @@
   EXPECT_EQ(observer.power_state_changes(), 2);
   EXPECT_EQ(observer.last_power_state(), false);
 
   // Repeated indications the device is off battery power should be suppressed.
   message_filter->OnMessageReceived(off_battery_msg);
   message_loop_.RunUntilIdle();
   EXPECT_EQ(observer.power_state_changes(), 2);
 }
 
 }  // namespace base