Instant: Use only one hidden WebContents per profile.

chrome/browser/instant/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/instant/instant_unload_handler.h"
 
 #include <algorithm>
 
 #include "base/message_loop.h"
 #include "chrome/browser/ui/browser_navigator.h"
@@ skipping 21 matching lines @@
     // 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);
 };
@@ skipping 41 matching lines @@
 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);
   MessageLoop::current()->DeleteSoon(FROM_HERE, delegate);
 }