Remove Chromecast extension support from cast system tray menu.

ash/common/cast_config_delegate.h

Index: ash/common/cast_config_delegate.h
diff --git a/ash/common/cast_config_delegate.h b/ash/common/cast_config_delegate.h
index 89cd85e547612edff257f744e576bb45e4448c8f..fc2a1664ee808804e8f3d22295de55fe62758dfe 100644
--- a/ash/common/cast_config_delegate.h
+++ b/ash/common/cast_config_delegate.h
@@ -85,11 +85,6 @@ class CastConfigDelegate {
 
   virtual ~CastConfigDelegate() {}
 
-  // Returns true if cast extension is installed.
-  // TODO(jdufault): Remove this function once the CastConfigDelegateChromeos is
-  // gone. See crbug.com/551132.
-  virtual bool HasCastExtension() const = 0;
-
   // Request fresh data from the backend. When the data is available, all
   // registered observers will get called.
   virtual void RequestDeviceRefresh() = 0;
@@ -101,16 +96,6 @@ class CastConfigDelegate {
   // is the identifier of the activity/route that should be stopped.
   virtual void StopCasting(const std::string& activity_id) = 0;
 
-  // Does the device have a settings page?
-  // TODO(jdufault): Remove this function once the CastConfigDelegateChromeos is
-  // gone. See crbug.com/551132.
-  virtual bool HasOptions() const = 0;
-
-  // Opens Options page for cast.
-  // TODO(jdufault): Remove this function once the CastConfigDelegateChromeos is
-  // gone. See crbug.com/551132.
-  virtual void LaunchCastOptions() = 0;
-
   // Add or remove an observer.
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;