Start moving core pieces of Chrome multi-process code to src\content.

chrome/browser/tab_contents/tab_contents_observer.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/tab_contents/tab_contents_observer.h"
-
-#include "chrome/browser/renderer_host/render_view_host.h"
-#include "chrome/browser/tab_contents/tab_contents.h"
-
-TabContentsObserver::TabContentsObserver(TabContents* tab_contents)
-    : tab_contents_(tab_contents),
-      routing_id_(tab_contents->render_view_host()->routing_id()) {
-  tab_contents_->AddObserver(this);
-}
-
-TabContentsObserver::~TabContentsObserver() {
-  if (tab_contents_)
-    tab_contents_->RemoveObserver(this);
-}
-
-bool TabContentsObserver::OnMessageReceived(const IPC::Message& message) {
-  return false;
-}
-
-bool TabContentsObserver::Send(IPC::Message* message) {
-  if (!tab_contents_->render_view_host()) {
-    delete message;
-    return false;
-  }
-
-  return tab_contents_->render_view_host()->Send(message);
-}