[M56] Have a list of pending checks instead of pending clients

chrome/browser/loader/safe_browsing_resource_throttle.h

Index: chrome/browser/loader/safe_browsing_resource_throttle.h
diff --git a/chrome/browser/loader/safe_browsing_resource_throttle.h b/chrome/browser/loader/safe_browsing_resource_throttle.h
index 17a93d716d2d9a6e9eb5c406d47e6223acb26dc6..c9eec29eefbc2b7d88a71fa7acdfb342ae156177 100644
--- a/chrome/browser/loader/safe_browsing_resource_throttle.h
+++ b/chrome/browser/loader/safe_browsing_resource_throttle.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_LOADER_SAFE_BROWSING_RESOURCE_THROTTLE_H_
 #define CHROME_BROWSER_LOADER_SAFE_BROWSING_RESOURCE_THROTTLE_H_
 
+#include <set>
 #include <string>
 #include <vector>
 
@@ -184,6 +185,11 @@ class SafeBrowsingResourceThrottle
   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(SafeBrowsingResourceThrottle);
 };