Set speculative bool on dns-preresolves in //content

content/browser/loader/resource_hints_impl.cc

 // Copyright 2016 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 "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/resource_context.h"
 #include "content/public/browser/resource_hints.h"
 #include "net/base/address_list.h"
@@ skipping 76 matching lines @@
 int PreresolveUrl(content::ResourceContext* resource_context,
                   const GURL& url,
                   const net::CompletionCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(resource_context);
 
   RequestHolder* request_holder = new RequestHolder();
   net::AddressList* addresses = new net::AddressList;
   net::HostResolver* resolver = resource_context->GetHostResolver();
   net::HostResolver::RequestInfo resolve_info(net::HostPortPair::FromURL(url));
+  resolve_info.set_is_speculative(true);
   return resolver->Resolve(
       resolve_info, net::IDLE, addresses,
       base::Bind(&OnResolveComplete, base::Owned(request_holder),
                  base::Owned(addresses), callback),
       request_holder->GetRequest(), net::NetLogWithSource());
 }
 
 }  // namespace content