Remove last usage functions from HostContentSettingsMap and clean up prefs

chrome/browser/media/webrtc/media_stream_devices_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media/webrtc/media_stream_devices_controller.h"
 
 #include <map>
 #include <utility>
 
 #include "base/callback_helpers.h"
@@ skipping 396 matching lines @@
       break;
     }
     case content::MEDIA_DEVICE_ACCESS: {
       // Get the default devices for the request.
       MediaCaptureDevicesDispatcher::GetInstance()->GetDefaultDevicesForProfile(
           profile_, audio_allowed, video_allowed, &devices);
       break;
     }
   }  // 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;
 }
 
 void MediaStreamDevicesController::RunCallback(
     ContentSetting audio_setting,
     ContentSetting video_setting,
     content::MediaStreamRequestResult denial_reason) {
   CHECK(!callback_.is_null());
 
   // If the kill switch is on we don't update the tab context or persist the
@@ skipping 168 matching lines @@
   if (android_permission_blocked)
     return false;
 
   // Don't approve device requests if the tab was hidden.
   // TODO(qinmin): Add a test for this. http://crbug.com/396869.
   // TODO(raymes): Shouldn't this apply to all permissions not just audio/video?
   return web_contents_->GetRenderWidgetHostView()->IsShowing();
 #endif
   return true;
 }