Remove some more OS_CHROMEOS from browser.

ash/test/test_shell_delegate.cc

 // 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.
 
 #include "ash/test/test_shell_delegate.h"
 
 #include <algorithm>
 
 #include "ash/screenshot_delegate.h"
 #include "ash/shell.h"
@@ skipping 42 matching lines @@
 
 void TestShellDelegate::OpenFileManager() {
 }
 
 void TestShellDelegate::OpenCrosh() {
 }
 
 void TestShellDelegate::OpenMobileSetup() {
 }
 
+void TestShellDelegate::ShowKeyboardOverlay(ui::AcceleratorTarget* target) {
+}
+
 content::BrowserContext* TestShellDelegate::GetCurrentBrowserContext() {
   return new TestBrowserContext();
 }
 
 void TestShellDelegate::ToggleSpokenFeedback() {
 }
 
 app_list::AppListViewDelegate* TestShellDelegate::CreateAppListViewDelegate() {
   return NULL;
 }
@@ skipping 13 matching lines @@
     SystemTray* tray) {
   return NULL;
 }
 
 UserWallpaperDelegate* TestShellDelegate::CreateUserWallpaperDelegate() {
   return NULL;
 }
 
 }  // namespace test
 }  // namespace ash