Revert of Proposed alternative for supporting ChromeVox keyboard commands.

chrome/browser/chromeos/accessibility/spoken_feedback_event_rewriter.h

-// Copyright 2015 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 CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_
-#define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_
-
-#include <vector>
-
-#include "ui/events/event_rewriter.h"
-
-namespace ui {
-class KeyEvent;
-}
-
-// Receives requests for spoken feedback enabled state and command dispatch.
-class SpokenFeedbackEventRewriterDelegate {
- public:
-  SpokenFeedbackEventRewriterDelegate() {}
-  virtual ~SpokenFeedbackEventRewriterDelegate() {}
-
-  // Returns true when ChromeVox is enabled.
-  virtual bool IsSpokenFeedbackEnabled() const;
-
-  // Returns true when |key_event| is dispatched to ChromeVox.
-  virtual bool DispatchKeyToChromeVox(const ui::KeyEvent key_event);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SpokenFeedbackEventRewriterDelegate);
-};
-
-// SpokenFeedbackEventRewriter discards all keyboard events mapped by the spoken
-// feedback manifest commands block. It dispatches the associated command name
-// directly to spoken feedback. This only occurs whenever spoken feedback is
-// enabled.
-class SpokenFeedbackEventRewriter : public ui::EventRewriter {
- public:
-  explicit SpokenFeedbackEventRewriter(
-      SpokenFeedbackEventRewriterDelegate* delegate);
-  ~SpokenFeedbackEventRewriter() override;
-
-  // EventRewriter:
-  ui::EventRewriteStatus RewriteEvent(
-      const ui::Event& event,
-      scoped_ptr<ui::Event>* new_event) override;
-  ui::EventRewriteStatus NextDispatchEvent(
-      const ui::Event& last_event,
-      scoped_ptr<ui::Event>* new_event) override;
-
- private:
-  // Default delegate implementation.
-  SpokenFeedbackEventRewriterDelegate default_delegate_;
-
-  // Active delegate (used for testing).
-  SpokenFeedbackEventRewriterDelegate* delegate_;
-
-  // Stores all key codes we've captured.
-  std::vector<int> captured_key_codes_;
-
-  DISALLOW_COPY_AND_ASSIGN(SpokenFeedbackEventRewriter);
-};
-
-#endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_