Revert of Add Ctrl+Alt+H as global shortcut to toggle high contrast mode.

ash/common/accelerators/accelerator_controller.cc

Index: ash/common/accelerators/accelerator_controller.cc
diff --git a/ash/common/accelerators/accelerator_controller.cc b/ash/common/accelerators/accelerator_controller.cc
index aa8bcf0573b83f1d71afcfe1d39df6d2c34ccccb..080315a496d03c481ef131ff4f91fb6f7348b9c6 100644
--- a/ash/common/accelerators/accelerator_controller.cc
+++ b/ash/common/accelerators/accelerator_controller.cc
@@ -464,12 +464,6 @@
       chromeos::input_method::InputMethodManager::Get();
   chromeos::input_method::ImeKeyboard* keyboard = ime->GetImeKeyboard();
   keyboard->SetCapsLockEnabled(!keyboard->CapsLockIsEnabled());
-}
-
-void HandleToggleHighContrast() {
-  base::RecordAction(UserMetricsAction("Accel_Toggle_High_Contrast"));
-
-  WmShell::Get()->accessibility_delegate()->ToggleHighContrast();
 }
 
 void HandleToggleSpokenFeedback() {
@@ -832,7 +826,6 @@
     case OPEN_GET_HELP:
     case SHOW_IME_MENU_BUBBLE:
     case SUSPEND:
-    case TOGGLE_HIGH_CONTRAST:
     case TOGGLE_SPOKEN_FEEDBACK:
     case TOGGLE_WIFI:
     case VOLUME_DOWN:
@@ -1050,9 +1043,6 @@
     case TOGGLE_CAPS_LOCK:
       HandleToggleCapsLock();
       break;
-    case TOGGLE_HIGH_CONTRAST:
-      HandleToggleHighContrast();
-      break;
     case TOGGLE_SPOKEN_FEEDBACK:
       HandleToggleSpokenFeedback();
       break;