Cull autofill entries older than 60 days.

chrome/browser/webdata/autofill_entry.h

Index: chrome/browser/webdata/autofill_entry.h
diff --git a/chrome/browser/webdata/autofill_entry.h b/chrome/browser/webdata/autofill_entry.h
index 8aae993ffd4b31747f5efc661195aca03581e7ff..f64abafe0b523e362071c4ba9e277d000ecbf462 100644
--- a/chrome/browser/webdata/autofill_entry.h
+++ b/chrome/browser/webdata/autofill_entry.h
@@ -46,9 +46,21 @@ class AutofillEntry {
 
   bool timestamps_culled() const { return timestamps_culled_; }
 
+  // Checks if any of the timestamps are older than |time|.
+  bool HasTimestampsOlder(base::Time time) const;
+
+  // Culls the |timestamps_| by expiring all prior to |expire_before|. Returns
+  // true if culling occured (and sets |timestamps_culled_|). Warning:
+  // |timestamps_| could become empty after this call.
+  bool CullExpiredTimeStamps(base::Time expire_before);
+
+  // The period after which Autofill entries should expire in days.
+  static const int64 kExpirationPeriodInDays = 60;
+
  private:
   FRIEND_TEST_ALL_PREFIXES(AutofillEntryTest, NoCulling);
   FRIEND_TEST_ALL_PREFIXES(AutofillEntryTest, Culling);
+  FRIEND_TEST_ALL_PREFIXES(AutofillEntryTest, CullByTime);
 
   // Culls the list of timestamps to |kMaxAutofillTimeStamps| latest timestamps.
   // Result is stored in |result|. If the original vtor's size is less