Speculative fix for a crash in SafeBrowsingResourceHandler

chrome/browser/renderer_host/safe_browsing_resource_handler.cc

 // Copyright (c) 2006-2008 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/renderer_host/safe_browsing_resource_handler.h"
 
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 
 // Maximum time to wait for a gethash response from the Safe Browsing servers.
 static const int kMaxGetHashMs = 1000;
@@ skipping 19 matching lines @@
   if (safe_browsing_->CheckUrl(url, this)) {
     safe_browsing_result_ = SafeBrowsingService::URL_SAFE;
     safe_browsing_->LogPauseDelay(base::TimeDelta());  // No delay.
   } else {
     AddRef();
     in_safe_browsing_check_ = true;
     // Can't pause now because it's too early, so we'll do it in OnWillRead.
   }
 }
 
+SafeBrowsingResourceHandler::~SafeBrowsingResourceHandler() {
+  // If we're being deleted before the SafeBrowsing check has completed, cancel
+  // the check.
+  if (in_safe_browsing_check_)
+    safe_browsing_->CancelCheck(this);
+}
+
 bool SafeBrowsingResourceHandler::OnUploadProgress(int request_id,
                                                    uint64 position,
                                                    uint64 size) {
   return next_handler_->OnUploadProgress(request_id, position, size);
 }
 
 bool SafeBrowsingResourceHandler::OnRequestRedirected(int request_id,
                                                       const GURL& new_url) {
   if (in_safe_browsing_check_) {
     Release();
@@ skipping 126 matching lines @@
           queued_security_info_);
       queued_error_.reset();
       queued_security_info_.clear();
     }
   } else {
     rdh_->CancelRequest(render_process_host_id_, paused_request_id_, false);
   }
 
   Release();
 }