mash: Refactor ChromeLauncherController's ShelfDelegate code.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.cc

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.cc
index 57194c1a9f3c6580b10ec29f05ef5b6cd3718652..a6e0edc0d2a95a2f8418456092d05d581e00cfef 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.cc
@@ -53,23 +53,11 @@ void ChromeLauncherControllerMus::CloseLauncherItem(ash::ShelfID id) {
   NOTIMPLEMENTED();
 }
 
-void ChromeLauncherControllerMus::Pin(ash::ShelfID id) {
-  NOTIMPLEMENTED();
-}
-
-void ChromeLauncherControllerMus::Unpin(ash::ShelfID id) {
-  NOTIMPLEMENTED();
-}
-
 bool ChromeLauncherControllerMus::IsPinned(ash::ShelfID id) {
   NOTIMPLEMENTED();
   return false;
 }
 
-void ChromeLauncherControllerMus::TogglePinned(ash::ShelfID id) {
-  NOTIMPLEMENTED();
-}
-
 void ChromeLauncherControllerMus::LockV1AppWithID(const std::string& app_id) {
   NOTIMPLEMENTED();
 }