Use PowerSaveBlocker for audio and video on Chrome OS.

content/browser/power_save_blocker_android.cc

Index: content/browser/power_save_blocker_android.cc
diff --git a/content/browser/power_save_blocker_android.cc b/content/browser/power_save_blocker_android.cc
index 2f79ef99f278928d7c7e3f389b2bf5e0cc38f456..19a4963693d0727aa59a00437c4198f2938d9db9 100644
--- a/content/browser/power_save_blocker_android.cc
+++ b/content/browser/power_save_blocker_android.cc
@@ -57,7 +57,8 @@ void PowerSaveBlockerImpl::Delegate::RemoveBlock() {
 }
 
 PowerSaveBlockerImpl::PowerSaveBlockerImpl(PowerSaveBlockerType type,
-                                           const std::string& reason) {
+                                           Reason reason,
+                                           const std::string& description) {
   // Don't support kPowerSaveBlockPreventAppSuspension
 }