Use PowerSaveBlocker for audio and video on Chrome OS.

content/browser/media/webrtc_internals.cc

Index: content/browser/media/webrtc_internals.cc
diff --git a/content/browser/media/webrtc_internals.cc b/content/browser/media/webrtc_internals.cc
index 56078a109ef776c177c00da488235ccd34c1bdeb..693c4db05f64a63d55aa45705d602f41177192fa 100644
--- a/content/browser/media/webrtc_internals.cc
+++ b/content/browser/media/webrtc_internals.cc
@@ -377,9 +377,11 @@ void WebRTCInternals::CreateOrReleasePowerSaveBlocker() {
   } else if (!peer_connection_data_.empty() && !power_save_blocker_) {
     DVLOG(1) << ("Preventing the application from being suspended while one or "
                  "more PeerConnections are active.");
-    power_save_blocker_ = content::PowerSaveBlocker::Create(
-        content::PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
-        "WebRTC has active PeerConnections.").Pass();
+    power_save_blocker_ =
+        content::PowerSaveBlocker::Create(
+            PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
+            PowerSaveBlocker::kReasonOther,
+            "WebRTC has active PeerConnections").Pass();
   }
 }