SystemMonitor refactoring: move power state monitor into a separate class called PowerMonitor

content/browser/gamepad/gamepad_test_helpers.h

Index: content/browser/gamepad/gamepad_test_helpers.h
diff --git a/content/browser/gamepad/gamepad_test_helpers.h b/content/browser/gamepad/gamepad_test_helpers.h
index 9abba01fd5fcbae611df7b22190481985791fec0..6b97edaa7a671f0eaccad69896693c97e5ac3f0a 100644
--- a/content/browser/gamepad/gamepad_test_helpers.h
+++ b/content/browser/gamepad/gamepad_test_helpers.h
@@ -12,10 +12,6 @@
 #include "content/browser/gamepad/gamepad_data_fetcher.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGamepads.h"
 
-namespace base {
-class SystemMonitor;
-}
-
 namespace content {
 
 class GamepadService;
@@ -60,8 +56,6 @@ class GamepadTestHelper {
   // This must be constructed before the system monitor.
   MessageLoop message_loop_;
 
-  scoped_ptr<base::SystemMonitor> system_monitor_;
-
   DISALLOW_COPY_AND_ASSIGN(GamepadTestHelper);
 };