Give up focus if the focused view becomes unfocusable

ui/views/controls/native_control.cc

 // Copyright (c) 2011 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/views/controls/native_control.h"
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
 #include <atlframe.h>
@@ skipping 159 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(NativeControlContainer);
 };
 
 NativeControl::NativeControl() : hwnd_view_(NULL),
                                  container_(NULL),
                                  fixed_width_(-1),
                                  horizontal_alignment_(CENTER),
                                  fixed_height_(-1),
                                  vertical_alignment_(CENTER) {
-  set_focusable(true);
+  SetFocusable(true);
 }
 
 NativeControl::~NativeControl() {
   if (container_) {
     container_->ResetParent();
     ::DestroyWindow(*container_);
   }
 }
 
 void NativeControl::ValidateNativeControl() {
@@ skipping 189 matching lines @@
   } else if (message == WM_DESTROY) {
     gfx::SetWindowProc(window, reinterpret_cast<WNDPROC>(original_handler));
     native_control->container_->prop_.reset();
   }
 
   return CallWindowProc(reinterpret_cast<WNDPROC>(original_handler), window,
                         message, w_param, l_param);
 }
 
 }  // namespace views