Revert 155950 - Add initial Chromium TestShell support for Android

chrome/android/testshell/testshell_stubs.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 "chrome/browser/android/tab_android.h"
-#include "chrome/browser/autofill/autofill_external_delegate.h"
-
-// This file contains temporary stubs to allow the libtestshell target to
-// compile. They will be removed once real implementations are
-// written/upstreamed, or once other code is refactored to eliminate the
-// need for them.
-
-// static
-TabAndroid* TabAndroid::FromWebContents(content::WebContents* web_contents) {
-  return NULL;
-}
-
-// static
-AutofillExternalDelegate* AutofillExternalDelegate::Create(
-    TabContents* tab_contents,
-    AutofillManager* manager) {
-  return NULL;
-}