[safe browsing] Switch to independent cache lifetimes for gethash items.

chrome/browser/safe_browsing/database_manager.h

Index: chrome/browser/safe_browsing/database_manager.h
diff --git a/chrome/browser/safe_browsing/database_manager.h b/chrome/browser/safe_browsing/database_manager.h
index 8f2b219b449470f0a9e21b46f8b4c5a84ad91e34..0ca1c8f5d4cb70fe3ca1f12c4ca65a9f39aa7b10 100644
--- a/chrome/browser/safe_browsing/database_manager.h
+++ b/chrome/browser/safe_browsing/database_manager.h
@@ -179,10 +179,9 @@ class SafeBrowsingDatabaseManager
 
   // Called on the IO thread when the SafeBrowsingProtocolManager has received
   // the full hash results for prefix hits detected in the database.
-  void HandleGetHashResults(
-      SafeBrowsingCheck* check,
-      const std::vector<SBFullHashResult>& full_hashes,
-      bool can_cache);
+  void HandleGetHashResults(SafeBrowsingCheck* check,
+                            const std::vector<SBFullHashResult>& full_hashes,
+                            const base::TimeDelta& cache_lifetime);
 
   // Log the user perceived delay caused by SafeBrowsing. This delay is the time
   // delta starting from when we would have started reading data from the
@@ -288,10 +287,6 @@ class SafeBrowsingDatabaseManager
   // database is a synchronous operation.
   void OnResetDatabase();
 
-  // Store in-memory the GetHash response. Runs on the database thread.
-  void CacheHashResults(const std::vector<SBPrefix>& prefixes,
-                        const std::vector<SBFullHashResult>& full_hashes);
-
   // Internal worker function for processing full hashes.
   void OnHandleGetHashResults(SafeBrowsingCheck* check,
                               const std::vector<SBFullHashResult>& full_hashes);