aura: Fix file-opening functions in platform_util.

chrome/browser/platform_util_aura.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 "chrome/browser/platform_util.h"
 
 #include "base/logging.h"
 #include "ui/aura/window.h"
 
 namespace platform_util {
 
-void ShowItemInFolder(const FilePath& full_path) {
-  // TODO(beng):
-  NOTIMPLEMENTED();
-}
-
-void OpenItem(const FilePath& full_path) {
-  // TODO(beng):
-  NOTIMPLEMENTED();
-}
-
-void OpenExternal(const GURL& url) {
-  // TODO(beng):
-  NOTIMPLEMENTED();
-}
-
 gfx::NativeWindow GetTopLevel(gfx::NativeView view) {
   return view->GetToplevelWindow();
 }
 
 gfx::NativeView GetParent(gfx::NativeView view) {
   return view->parent();
 }
 
 bool IsWindowActive(gfx::NativeWindow window) {
   return window->IsActive();
 }
 
 void ActivateWindow(gfx::NativeWindow window) {
   window->Activate();
 }
 
 bool IsVisible(gfx::NativeView view) {
   return view->IsVisible();
 }
 
 }  // namespace platform_util