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 ba1a834f22c8f839ec770b58528c02d2e108d1da..1a7f75ab7087195af4340adeeda997736111cad2 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;
 }