(Try 2) InstantExtended: remove dead code related to the non-cacheable NTP.

chrome/browser/ui/search/instant_unload_handler.cc

-// Copyright 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/ui/search/instant_unload_handler.h"
-
-#include <algorithm>
-
-#include "base/message_loop/message_loop.h"
-#include "chrome/browser/ui/browser_navigator.h"
-#include "content/public/browser/render_view_host.h"
-#include "content/public/browser/web_contents.h"
-#include "content/public/browser/web_contents_delegate.h"
-
-class InstantUnloadHandler::WebContentsDelegateImpl
-    : public content::WebContentsDelegate {
- public:
-  WebContentsDelegateImpl(InstantUnloadHandler* handler,
-                          scoped_ptr<content::WebContents> contents,
-                          int index)
-      : handler_(handler),
-        contents_(contents.Pass()),
-        index_(index) {
-    contents_->SetDelegate(this);
-    contents_->GetRenderViewHost()->FirePageBeforeUnload(false);
-  }
-
-  // Overridden from content::WebContentsDelegate:
-  virtual void CloseContents(content::WebContents* source) OVERRIDE {
-    DCHECK_EQ(contents_, source);
-    // Remove ourselves as the delegate, so that CloseContents() won't be
-    // called twice, leading to double deletion (http://crbug.com/155848).
-    contents_->SetDelegate(NULL);
-    handler_->Destroy(this);
-  }
-
-  virtual void WillRunBeforeUnloadConfirm() OVERRIDE {
-    contents_->SetDelegate(NULL);
-    handler_->Activate(this, contents_.Pass(), index_);
-  }
-
-  virtual bool ShouldSuppressDialogs() OVERRIDE {
-    return true;
-  }
-
- private:
-  InstantUnloadHandler* const handler_;
-  scoped_ptr<content::WebContents> contents_;
-
-  // The tab strip index |contents_| was originally at. If we add the tab back
-  // to the tabstrip, we add it at this index.
-  const int index_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebContentsDelegateImpl);
-};
-
-InstantUnloadHandler::InstantUnloadHandler(Browser* browser)
-    : browser_(browser) {
-}
-
-InstantUnloadHandler::~InstantUnloadHandler() {
-}
-
-void InstantUnloadHandler::RunUnloadListenersOrDestroy(
-    scoped_ptr<content::WebContents> contents,
-    int index) {
-  DCHECK(!contents->GetDelegate());
-
-  if (!contents->NeedToFireBeforeUnload()) {
-    // Tab doesn't have any beforeunload listeners and can be safely deleted.
-    // However, the tab object should not be deleted immediately because when we
-    // get here from BrowserInstantController::TabDeactivated, other tab
-    // observers may still expect to interact with the tab before the event has
-    // finished propagating.
-    base::MessageLoop::current()->DeleteSoon(FROM_HERE, contents.release());
-    return;
-  }
-
-  // Tab has beforeunload listeners. Install a delegate to run them.
-  delegates_.push_back(
-      new WebContentsDelegateImpl(this, contents.Pass(), index));
-}
-
-void InstantUnloadHandler::Activate(WebContentsDelegateImpl* delegate,
-                                    scoped_ptr<content::WebContents> contents,
-                                    int index) {
-  // Remove (and delete) the delegate.
-  Destroy(delegate);
-
-  // Add the tab back in.
-  chrome::NavigateParams params(browser_, contents.release());
-  params.disposition = NEW_FOREGROUND_TAB;
-  params.tabstrip_index = index;
-  chrome::Navigate(&params);
-}
-
-void InstantUnloadHandler::Destroy(WebContentsDelegateImpl* delegate) {
-  ScopedVector<WebContentsDelegateImpl>::iterator i =
-      std::find(delegates_.begin(), delegates_.end(), delegate);
-  DCHECK(i != delegates_.end());
-
-  // The delegate's method is a caller on the stack, so schedule the deletion
-  // for later.
-  delegates_.weak_erase(i);
-  base::MessageLoop::current()->DeleteSoon(FROM_HERE, delegate);
-}