Turn off safebrowsing for PREFETCH requests

chrome/browser/renderer_host/safe_browsing_resource_handler.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/renderer_host/safe_browsing_resource_handler.h"
 
 #include "base/logging.h"
 #include "content/browser/renderer_host/global_request_id.h"
 #include "content/browser/renderer_host/resource_dispatcher_host.h"
 #include "content/browser/renderer_host/resource_message_filter.h"
 #include "content/common/resource_response.h"
+#include "net/base/io_buffer.h"
+#include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
-#include "net/base/io_buffer.h"
+#include "net/url_request/url_request.h"
 
 // Maximum time in milliseconds to wait for the safe browsing service to
 // verify a URL. After this amount of time the outstanding check will be
 // aborted, and the URL will be treated as if it were safe.
 static const int kCheckUrlTimeoutMs = 5000;
 
 // TODO(eroman): Downgrade these CHECK()s to DCHECKs once there is more
 //               unit test coverage.
 
 SafeBrowsingResourceHandler::SafeBrowsingResourceHandler(
@@ skipping 127 matching lines @@
 
   if (result == SafeBrowsingService::SAFE) {
     // Log how much time the safe browsing check cost us.
     base::TimeDelta pause_delta;
     pause_delta = base::TimeTicks::Now() - url_check_start_time_;
     safe_browsing_->LogPauseDelay(pause_delta);
 
     // Continue the request.
     ResumeRequest();
   } else {
-    StartDisplayingBlockingPage(url, result);
+    const net::URLRequest* request = rdh_->GetURLRequest(
+        GlobalRequestID(render_process_host_id_, deferred_request_id_));
+    if (request->load_flags() & net::LOAD_PREFETCH) {
+      // Don't prefetch resources that fail safe browsing, disallow
+      // them.
+      rdh_->CancelRequest(render_process_host_id_, deferred_request_id_, false);
+    } else {
+      StartDisplayingBlockingPage(url, result);
+    }
   }
 
   Release();  // Balances the AddRef() in CheckingUrl().
 }
 
 void SafeBrowsingResourceHandler::StartDisplayingBlockingPage(
     const GURL& url,
     SafeBrowsingService::UrlCheckResult result) {
   CHECK(state_ == STATE_NONE);
   CHECK(defer_state_ != DEFERRED_NONE);
@@ skipping 125 matching lines @@
     rdh_->FollowDeferredRedirect(render_process_host_id_, request_id,
                                  false, GURL());
   }
 }
 
 void SafeBrowsingResourceHandler::ClearDeferredRequestInfo() {
   deferred_request_id_ = -1;
   deferred_url_ = GURL();
   deferred_redirect_response_ = NULL;
 }