chromeos: Simplify power supply info in PowerLibrary

chrome/browser/automation/testing_automation_provider.cc

Index: chrome/browser/automation/testing_automation_provider.cc
diff --git a/chrome/browser/automation/testing_automation_provider.cc b/chrome/browser/automation/testing_automation_provider.cc
index 4c246387c40efcc7523dd0b74c791dd8bea2e19d..b0da22312871dd2dd19934882a67ed8797593293 100644
--- a/chrome/browser/automation/testing_automation_provider.cc
+++ b/chrome/browser/automation/testing_automation_provider.cc
@@ -133,6 +133,7 @@
 #endif
 
 #if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/ui/webui/active_downloads_ui.h"
 #else
 #include "chrome/browser/download/download_shelf.h"
@@ -188,6 +189,9 @@ TestingAutomationProvider::TestingAutomationProvider(Profile* profile)
   BrowserList::AddObserver(this);
   registrar_.Add(this, chrome::NOTIFICATION_SESSION_END,
                  content::NotificationService::AllSources());
+#if defined(OS_CHROMEOS)
+  chromeos::CrosLibrary::Get()->GetPowerLibrary()->AddObserver(this);
+#endif
 }
 
 TestingAutomationProvider::~TestingAutomationProvider() {