Remove "API proposal for chrome.app.window to intercept all keys."

chrome/browser/ui/views/apps/desktop_keyboard_capture.cc

-// 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.
-
-#include "chrome/browser/ui/views/apps/desktop_keyboard_capture.h"
-#include "chrome/browser/ui/views/apps/keyboard_hook_handler.h"
-
-DesktopKeyboardCapture::DesktopKeyboardCapture(views::Widget* widget)
-    : widget_(widget), is_registered_(false) {
-  widget_->AddObserver(this);
-
-  if (widget_->IsActive())
-    RegisterKeyboardHooks();
-}
-
-DesktopKeyboardCapture::~DesktopKeyboardCapture() {
-  if (is_registered_)
-    DeregisterKeyboardHooks();
-
-  widget_->RemoveObserver(this);
-}
-
-void DesktopKeyboardCapture::RegisterKeyboardHooks() {
-  KeyboardHookHandler::GetInstance()->Register(widget_);
-  is_registered_ = true;
-}
-
-void DesktopKeyboardCapture::DeregisterKeyboardHooks() {
-  KeyboardHookHandler::GetInstance()->Deregister(widget_);
-  is_registered_ = false;
-}
-
-void DesktopKeyboardCapture::OnWidgetActivationChanged(views::Widget* widget,
-                                                       bool active) {
-  if (active) {
-    RegisterKeyboardHooks();
-  } else {
-    DeregisterKeyboardHooks();
-  }
-}