Revert "Allow MessageFilters to restrict listening to specific message classes"

content/browser/renderer_host/media/device_request_message_filter.cc

 // Copyright 2013 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 "content/browser/renderer_host/media/device_request_message_filter.h"
 
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/common/media/media_stream_messages.h"
 #include "content/public/browser/resource_context.h"
 
 // Clears the MediaStreamDevice.name from all devices in |device_list|.
 static void ClearDeviceLabels(content::StreamDeviceInfoArray* devices) {
   for (content::StreamDeviceInfoArray::iterator device_itr = devices->begin();
        device_itr != devices->end();
        ++device_itr) {
     device_itr->device.name.clear();
   }
 }
 
 namespace content {
 
 DeviceRequestMessageFilter::DeviceRequestMessageFilter(
     ResourceContext* resource_context,
     MediaStreamManager* media_stream_manager)
-    : BrowserMessageFilter(MediaStreamMsgStart),
-      resource_context_(resource_context),
+    : resource_context_(resource_context),
       media_stream_manager_(media_stream_manager) {
   DCHECK(resource_context);
   DCHECK(media_stream_manager);
 }
 
 DeviceRequestMessageFilter::~DeviceRequestMessageFilter() {
   // CHECK rather than DCHECK to make sure this never happens in the
   // wild. We want to be sure due to http://crbug.com/341211
   CHECK(requests_.empty());
 }
@@ skipping 107 matching lines @@
   const std::string& video_label = media_stream_manager_->EnumerateDevices(
       this, -1, -1, resource_context_->GetMediaDeviceIDSalt(), -1,
       MEDIA_DEVICE_VIDEO_CAPTURE, security_origin);
   DCHECK(!video_label.empty());
 
   requests_.push_back(DeviceRequest(
       request_id, security_origin, audio_label, video_label));
 }
 
 }  // namespace content