Replaced synthetic MouseEvent in CustomButton::AcceleratorPressed() with just an Event.

ui/base/accelerators/accelerator.cc

 // Copyright (c) 2012 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.
 
 #include "ui/base/accelerators/accelerator.h"
 
 #include <stdint.h>
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
@@ skipping 49 matching lines @@
 }
 
 Accelerator::~Accelerator() {
 }
 
 // static
 int Accelerator::MaskOutKeyEventFlags(int flags) {
   return flags & kModifierMask;
 }
 
+KeyEvent Accelerator::ToKeyEvent() const {
+  return KeyEvent(key_state() == Accelerator::KeyState::PRESSED
+                      ? ET_KEY_PRESSED
+                      : ET_KEY_RELEASED,
+                  key_code(), modifiers());
+}
+
 Accelerator& Accelerator::operator=(const Accelerator& accelerator) {
   if (this != &accelerator) {
     key_code_ = accelerator.key_code_;
     key_state_ = accelerator.key_state_;
     modifiers_ = accelerator.modifiers_;
     if (accelerator.platform_accelerator_)
       platform_accelerator_ = accelerator.platform_accelerator_->CreateCopy();
     else
       platform_accelerator_.reset();
   }
@@ skipping 203 matching lines @@
 
     // Subtracting the size of the shortcut key and 1 for the '+' sign.
     shortcut_rtl.append(shortcut, 0, shortcut.length() - key_length - 1);
     shortcut.swap(shortcut_rtl);
   }
 
   return shortcut;
 }
 
 }  // namespace ui