Remove Chromecast extension support from cast system tray menu.

ash/common/cast_config_delegate.cc

Index: ash/common/cast_config_delegate.cc
diff --git a/ash/common/cast_config_delegate.cc b/ash/common/cast_config_delegate.cc
index 6c6902b500b2b0c3c7902c3a7ff30f53f5f35fad..53de51a1c0fdfef1522e70258d9a024eecc3768c 100644
--- a/ash/common/cast_config_delegate.cc
+++ b/ash/common/cast_config_delegate.cc
@@ -6,16 +6,16 @@
 
 namespace ash {
 
-CastConfigDelegate::Receiver::Receiver() {}
+CastConfigDelegate::Sink::Sink() {}
 
-CastConfigDelegate::Receiver::~Receiver() {}
+CastConfigDelegate::Sink::~Sink() {}
 
-CastConfigDelegate::Activity::Activity() {}
+CastConfigDelegate::Route::Route() {}
 
-CastConfigDelegate::Activity::~Activity() {}
+CastConfigDelegate::Route::~Route() {}
 
-CastConfigDelegate::ReceiverAndActivity::ReceiverAndActivity() {}
+CastConfigDelegate::SinkAndRoute::SinkAndRoute() {}
 
-CastConfigDelegate::ReceiverAndActivity::~ReceiverAndActivity() {}
+CastConfigDelegate::SinkAndRoute::~SinkAndRoute() {}
 
 }  // namespace ash