events: keycodes: Remove the stateless singleton instance of KeycodeConverter

remoting/host/input_injector_mac.cc

Index: remoting/host/input_injector_mac.cc
diff --git a/remoting/host/input_injector_mac.cc b/remoting/host/input_injector_mac.cc
index c5e870026e3deff4e3e9205e2a6902b76f579821..f695d95e6a00e1ed8b1bbc0be3136ec7163a7983 100644
--- a/remoting/host/input_injector_mac.cc
+++ b/remoting/host/input_injector_mac.cc
@@ -179,14 +179,14 @@ void InputInjectorMac::Core::InjectKeyEvent(const KeyEvent& event) {
   if (!event.has_pressed() || !event.has_usb_keycode())
     return;
 
-  ui::KeycodeConverter* key_converter = ui::KeycodeConverter::GetInstance();
-  int keycode = key_converter->UsbKeycodeToNativeKeycode(event.usb_keycode());
+  int keycode =
+      ui::KeycodeConverter::UsbKeycodeToNativeKeycode(event.usb_keycode());
 
   VLOG(3) << "Converting USB keycode: " << std::hex << event.usb_keycode()
           << " to keycode: " << keycode << std::dec;
 
   // If we couldn't determine the Mac virtual key code then ignore the event.
-  if (keycode == key_converter->InvalidNativeKeycode())
+  if (keycode == ui::KeycodeConverter::InvalidNativeKeycode())
     return;
 
   // If this is a modifier key, remember its new state so that it can be