fix comparison of StreamDeviceInfoArray.

content/browser/renderer_host/media/media_stream_manager.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 "content/browser/renderer_host/media/media_stream_manager.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 528 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   // Only cache device list when there is EnumerateDevices request, since
   // other requests don't turn on device monitoring.
   bool need_update_clients = false;
   EnumerationCache* cache =
       (stream_type == content::MEDIA_STREAM_DEVICE_TYPE_AUDIO_CAPTURE ?
        &audio_enumeration_cache_ : &video_enumeration_cache_);
   if (HasEnumerationRequest(stream_type) &&
       (!cache->valid ||
+       devices.size() != cache->devices.size() ||
        !std::equal(devices.begin(), devices.end(), cache->devices.begin(),
                    media_stream::StreamDeviceInfo::IsEqual))) {
     cache->valid = true;
     cache->devices = devices;
     need_update_clients = true;
   }
 
   // Publish the result for all requests waiting for device list(s).
   // Find the requests waiting for this device list, store their labels and
   // release the iterator before calling device settings. We might get a call
@@ skipping 313 matching lines @@
        it != requests_.end(); ++it) {
     if (it->second.type == DeviceRequest::ENUMERATE_DEVICES &&
         Requested(it->second.options, stream_type)) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace media_stream