Add enable_vp9 option to host config.

remoting/host/chromoting_host.cc

Index: remoting/host/chromoting_host.cc
diff --git a/remoting/host/chromoting_host.cc b/remoting/host/chromoting_host.cc
index 942e643e7c1dc35ea4bfaa15ae6b647bbcf69e19..6558dbb1c5de20ef3525bce125fb4bf8a2183f6e 100644
--- a/remoting/host/chromoting_host.cc
+++ b/remoting/host/chromoting_host.cc
@@ -31,8 +31,6 @@ namespace remoting {
 
 namespace {
 
-const char kEnableVp9SwitchName[] = "enable-vp9";
-
 const net::BackoffEntry::Policy kDefaultBackoffPolicy = {
   // Number of initial errors (in sequence) to ignore before applying
   // exponential back-off rules.
@@ -92,11 +90,6 @@ ChromotingHost::ChromotingHost(
 
   jingle_glue::JingleThreadWrapper::EnsureForCurrentMessageLoop();
 
-  // Enable VP9 if specified on the command-line.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(kEnableVp9SwitchName)) {
-    protocol_config_->EnableVideoCodec(protocol::ChannelConfig::CODEC_VP9);
-  }
-
   if (!desktop_environment_factory_->SupportsAudioCapture()) {
     protocol_config_->DisableAudioChannel();
   }