Have a list of pending checks instead of pending clients

components/safe_browsing/base_safe_browsing_resource_throttle.h

Index: components/safe_browsing/base_safe_browsing_resource_throttle.h
diff --git a/components/safe_browsing/base_safe_browsing_resource_throttle.h b/components/safe_browsing/base_safe_browsing_resource_throttle.h
index 858f67eaae8bc6aecc233ba42cdd911ba94d91f0..4cd18ca650fe91cc9dc4193d4c1f74b32f4e49aa 100644
--- a/components/safe_browsing/base_safe_browsing_resource_throttle.h
+++ b/components/safe_browsing/base_safe_browsing_resource_throttle.h
@@ -5,6 +5,7 @@
 #ifndef COMPONENTS_SAFE_BROWSING_BASE_SAFE_BROWSING_RESOURCE_THROTTLE_H_
 #define COMPONENTS_SAFE_BROWSING_BASE_SAFE_BROWSING_RESOURCE_THROTTLE_H_
 
+#include <set>
 #include <string>
 #include <vector>
 
@@ -172,6 +173,11 @@ class BaseSafeBrowsingResourceThrottle
   const content::ResourceType resource_type_;
   net::NetLogWithSource net_log_with_source_;
 
+  // TODO(vakh): The following set should be removed after fixing
+  // http://crbug.com/660293
+  // URLs that timed out waiting for a SafeBrowsing reputation check.
+  std::set<GURL> timed_out_urls_;
+
   DISALLOW_COPY_AND_ASSIGN(BaseSafeBrowsingResourceThrottle);
 };