Remove last usage functions from HostContentSettingsMap and clean up prefs

chrome/browser/media/webrtc/media_stream_devices_controller.cc

Index: chrome/browser/media/webrtc/media_stream_devices_controller.cc
diff --git a/chrome/browser/media/webrtc/media_stream_devices_controller.cc b/chrome/browser/media/webrtc/media_stream_devices_controller.cc
index ac74b659e72b7dbf0b2e0e741e4abad6b02c9fca..480e70c5d796d0ee4a0c54b04e5a71892b30ff4f 100644
--- a/chrome/browser/media/webrtc/media_stream_devices_controller.cc
+++ b/chrome/browser/media/webrtc/media_stream_devices_controller.cc
@@ -414,21 +414,6 @@ content::MediaStreamDevices MediaStreamDevicesController::GetDevices(
     }
   }  // switch
 
-  if (audio_allowed) {
-    HostContentSettingsMapFactory::GetForProfile(profile_)
-        ->UpdateLastUsageByPattern(
-            ContentSettingsPattern::FromURLNoWildcard(request_.security_origin),
-            ContentSettingsPattern::Wildcard(),
-            CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC);
-  }
-  if (video_allowed) {
-    HostContentSettingsMapFactory::GetForProfile(profile_)
-        ->UpdateLastUsageByPattern(
-            ContentSettingsPattern::FromURLNoWildcard(request_.security_origin),
-            ContentSettingsPattern::Wildcard(),
-            CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA);
-  }
-
   return devices;
 }