focus reverse traversal was not working for TextfieldViews.

views/controls/textfield/native_textfield_gtk.h

Index: views/controls/textfield/native_textfield_gtk.h
diff --git a/views/controls/textfield/native_textfield_gtk.h b/views/controls/textfield/native_textfield_gtk.h
index 7e1f7e86578996aa8a0378c1cab9c33cd0c2f232..afbb154832c9b18f32f029b63af7eac35d3cb61d 100644
--- a/views/controls/textfield/native_textfield_gtk.h
+++ b/views/controls/textfield/native_textfield_gtk.h
@@ -41,19 +41,26 @@ class NativeTextfieldGtk : public NativeControlGtk,
   virtual void UpdateFont();
   virtual void UpdateIsPassword();
   virtual void UpdateEnabled();
-  virtual bool IsPassword();
   virtual gfx::Insets CalculateInsets();
   virtual void UpdateHorizontalMargins();
   virtual void UpdateVerticalMargins();
-  virtual void SetFocus();
+  virtual bool SetFocus();
   virtual View* GetView();
   virtual gfx::NativeView GetTestingHandle() const;
   virtual bool IsIMEComposing() const;
+  virtual bool HandleKeyPressed(const views::KeyEvent& e);
+  virtual bool HandleKeyReleased(const views::KeyEvent& e);
+  virtual void HandleWillGainFocus();
+  virtual void HandleDidGainFocus();
+  virtual void HandleWillLoseFocus();
 
   // Overridden from NativeControlGtk:
   virtual void CreateNativeControl();
   virtual void NativeControlCreated(GtkWidget* widget);
 
+  // Returns true if the textfield is for password.
+  bool IsPassword();
+
  private:
   Textfield* textfield_;