Mac Video Capture: Connect AVFoundation for Dev Channel builds

BUG=408089

Review URL: https://codereview.chromium.org/530983002

Cr-Commit-Position: refs/heads/master@{#292919}

chrome/browser/media/media_capture_devices_dispatcher.cc

@@ -301,11 +301,13 @@ MediaCaptureDevicesDispatcher::MediaCaptureDevicesDispatcher()
       content::NotificationService::AllSources());
 
   // AVFoundation is used for video/audio device monitoring and video capture in
-  // Mac. Experimentally, connect it in Canary and Unknown (developer builds).
+  // Mac. Experimentally, connect it in Dev, Canary and Unknown (developer
+  // builds).
 #if defined(OS_MACOSX)
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
   if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kForceQTKit)) {
-    if (channel == chrome::VersionInfo::CHANNEL_CANARY ||
+    if (channel == chrome::VersionInfo::CHANNEL_DEV ||
+        channel == chrome::VersionInfo::CHANNEL_CANARY ||
         channel == chrome::VersionInfo::CHANNEL_UNKNOWN) {
       CommandLine::ForCurrentProcess()->AppendSwitch(
           switches::kEnableAVFoundation);