Make BrowserMainParts have an empty implementation to make embedding easier.

chrome/browser/chrome_browser_main_extra_parts.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/chrome_browser_main_extra_parts.h"
-
-ChromeBrowserMainExtraParts::ChromeBrowserMainExtraParts() {
-}
-
-ChromeBrowserMainExtraParts::~ChromeBrowserMainExtraParts() {
-}
-
-void ChromeBrowserMainExtraParts::PreEarlyInitialization() {
-}
-
-void ChromeBrowserMainExtraParts::PostEarlyInitialization() {
-}
-
-void ChromeBrowserMainExtraParts::PreMainMessageLoopStart() {
-}
-
-void ChromeBrowserMainExtraParts::PostMainMessageLoopStart() {
-}
-
-void ChromeBrowserMainExtraParts::ToolkitInitialized() {
-}
-
-void ChromeBrowserMainExtraParts::PreProfileInit() {
-}
-
-void ChromeBrowserMainExtraParts::PostProfileInit() {
-}
-
-void ChromeBrowserMainExtraParts::PreBrowserStart() {
-}
-
-void ChromeBrowserMainExtraParts::PostBrowserStart() {
-}
-
-void ChromeBrowserMainExtraParts::PreMainMessageLoopRun() {
-}
-
-void ChromeBrowserMainExtraParts::PostMainMessageLoopRun() {
-}