Decouple PowerUsageMonitor{Impl} from //content/browser

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 6e3e14b2cc96c364e574a4d97e1b5cb07c1a5512..897c26f90bc41c3f28c87552fc9a5a7f9bdb0375 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -153,7 +153,6 @@
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
-#include "content/public/browser/power_usage_monitor.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_features.h"
@@ -1932,7 +1931,8 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   browser_creator_.reset();
 
 #if !defined(OS_LINUX) || defined(OS_CHROMEOS)  // http://crbug.com/426393
-  content::StartPowerUsageMonitor();
+  power_usage_monitor_.reset(new PowerUsageMonitor());
+  power_usage_monitor_->Start();
 #endif  // !defined(OS_LINUX) || defined(OS_CHROMEOS)
 
   process_power_collector_.reset(new ProcessPowerCollector);