Fix virtual keyboard overscroll on Athena

athena/virtual_keyboard/virtual_keyboard_manager_impl.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 "athena/virtual_keyboard/public/virtual_keyboard_manager.h"
 
 #include "athena/screen/public/screen_manager.h"
 #include "athena/util/container_priorities.h"
 #include "athena/util/fill_layout_manager.h"
 #include "base/bind.h"
@@ skipping 72 matching lines @@
     container_->SetLayoutManager(new FillLayoutManager(container_));
 
     keyboard::KeyboardController* controller = new keyboard::KeyboardController(
         new BasicKeyboardControllerProxy(browser_context_,
                                          container_->GetRootWindow()));
     // ResetInstance takes ownership.
     keyboard::KeyboardController::ResetInstance(controller);
     aura::Window* kb_container = controller->GetContainerWindow();
     FillLayoutManager::SetAlwaysFill(kb_container);
     container_->AddChild(kb_container);
-    kb_container->Show();
   }
 
   content::BrowserContext* browser_context_;
   aura::Window* container_;
 
   DISALLOW_COPY_AND_ASSIGN(VirtualKeyboardManagerImpl);
 };
 
 }  // namespace
 
@@ skipping 14 matching lines @@
   return instance;
 }
 
 void VirtualKeyboardManager::Shutdown() {
   CHECK(instance);
   delete instance;
   CHECK(!instance);
 }
 
 }  // namespace athena