Simplify AcceleratorDelegate interface

ui/wm/core/accelerator_delegate.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_WM_CORE_ACCELERATOR_DELEGATE_H_
 #define UI_WM_CORE_ACCELERATOR_DELEGATE_H_
 
 namespace ui {
 class Accelerator;
 class KeyEvent;
 }
 
 namespace wm {
 
 class AcceleratorDelegate {
  public:
   virtual ~AcceleratorDelegate() {}
 
+  // Type of keys that triggers accelerators.
+  enum KeyType {
+    KEY_TYPE_SYSTEM,
+    KEY_TYPE_OTHER,
+  };
+
   // TODO(oshima): Move the repeat detection to AcceleratorFilter.
   virtual void PreProcessAccelerator(const ui::Accelerator& accelerator) = 0;
 
-  // Returns true if the window should be allowed a chance to handle
-  // system keys.
-  virtual bool CanConsumeSystemKeys(const ui::KeyEvent& event) = 0;
-
-  // Returns true if the |accelerator| should be processed.
-  virtual bool ShouldProcessAcceleratorNow(
-      const ui::KeyEvent& key_event,
-      const ui::Accelerator& accelerator) = 0;
-
   // Return true if the |accelerator| has been processed.
-  virtual bool ProcessAccelerator(const ui::Accelerator& accelerator) = 0;
+  virtual bool ProcessAccelerator(const ui::KeyEvent& event,
+                                  const ui::Accelerator& accelerator,
+                                  KeyType key_type) = 0;
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_ACCELERATOR_DELEGATE_H_