MacViewsBrowser: Fix omnibox crash due to failed DCHECK.

ui/views/controls/textfield/textfield.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 194 matching lines @@
 
   // View overrides:
   gfx::Insets GetInsets() const override;
   int GetBaseline() const override;
   gfx::Size GetPreferredSize() const override;
   const char* GetClassName() const override;
   gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
   bool OnMousePressed(const ui::MouseEvent& event) override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
   void OnMouseReleased(const ui::MouseEvent& event) override;
-  bool OnKeyPressed(const ui::KeyEvent& event) override;
-  bool OnKeyReleased(const ui::KeyEvent& event) override;
   void OnGestureEvent(ui::GestureEvent* event) override;
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
   bool CanHandleAccelerators() const override;
   void AboutToRequestFocusFromTabTraversal(bool reverse) override;
   bool SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) override;
   bool GetDropFormats(
       int* formats,
       std::set<ui::Clipboard::FormatType>* format_types) override;
   bool CanDrop(const ui::OSExchangeData& data) override;
   int OnDragUpdated(const ui::DropTargetEvent& event) override;
@@ skipping 89 matching lines @@
 
   // Get the text from the selection clipboard.
   virtual base::string16 GetSelectionClipboardText() const;
 
   // Executes the given |command|.
   virtual void ExecuteTextEditCommand(ui::TextEditCommand command);
 
  private:
   friend class TextfieldTestApi;
 
+  // View overrides:
+  // Declared final since overriding by subclasses would interfere with the
+  // accounting related to the scheduled text edit command. Subclasses should
+  // use TextfieldController::HandleKeyEvent, to intercept the key event.
+  bool OnKeyPressed(const ui::KeyEvent& event) final;
+  bool OnKeyReleased(const ui::KeyEvent& event) final;
+
   // Handles a request to change the value of this text field from software
   // using an accessibility API (typically automation software, screen readers
   // don't normally use this). Sets the value and clears the selection.
   void AccessibilitySetValue(const base::string16& new_value);
 
   // Updates the painted background color.
   void UpdateBackgroundColor();
 
   // Does necessary updates when the text and/or cursor position changes.
   void UpdateAfterChange(bool text_changed, bool cursor_changed);
@@ skipping 148 matching lines @@
 
   // Used to bind callback functions to this object.
   base::WeakPtrFactory<Textfield> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Textfield);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_