enable media stream by default.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
===================================================================
--- content/renderer/render_thread_impl.cc	(revision 136661)
+++ content/renderer/render_thread_impl.cc	(working copy)
@@ -527,8 +527,7 @@
   WebRuntimeFeatures::enableMediaPlayer(
       media::IsMediaLibraryInitialized());
 
-  WebKit::WebRuntimeFeatures::enableMediaStream(
-      command_line.HasSwitch(switches::kEnableMediaStream));
+  WebKit::WebRuntimeFeatures::enableMediaStream(true);

[jam, 2012/05/14 06:30:11]

nit: since this is always true, just get rid of this function?

[wjia(left Chromium), 2012/05/14 20:42:17]

This is the WebKit function to set media stream flag in WebKit. WebKit has false
as default.

 
   WebKit::WebRuntimeFeatures::enablePeerConnection(
       command_line.HasSwitch(switches::kEnablePeerConnection));
@@ -921,10 +920,6 @@
 WebKit::WebMediaStreamCenter* RenderThreadImpl::CreateMediaStreamCenter(
     WebKit::WebMediaStreamCenterClient* client) {
 #if defined(ENABLE_WEBRTC)
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableMediaStream)) {
-    return NULL;
-  }
   if (!media_stream_center_)
     media_stream_center_ = new content::MediaStreamCenter(client);
 #endif