[Autofill] Fix profiles with bad |use_date| values.

components/autofill/core/browser/personal_data_manager.cc

 // Copyright 2013 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 "components/autofill/core/browser/personal_data_manager.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <list>
 #include <map>
@@ skipping 306 matching lines @@
       pending_profiles_query_ = 0;
     return;
   }
 
   switch (result->GetType()) {
     case AUTOFILL_PROFILES_RESULT:
       if (h == pending_profiles_query_) {
         ReceiveLoadedDbValues(h, result, &pending_profiles_query_,
                               &web_profiles_);
         LogProfileCount();  // This only logs local profiles.
+        ApplyProfileUseDatesFix();
       } else {
         ReceiveLoadedDbValues(h, result, &pending_server_profiles_query_,
                               &server_profiles_);
 
         if (!server_profiles_.empty()) {
           std::string account_id = signin_manager_->GetAuthenticatedAccountId();
           base::string16 email =
               base::UTF8ToUTF16(
                   account_tracker_->GetAccountInfo(account_id).email);
 
@@ skipping 1259 matching lines @@
         // existing profiles.
         profile_to_merge = existing_profile;
       }
     }
   }
 
   AutofillMetrics::LogNumberOfProfilesRemovedDuringDedupe(
       profile_guids_to_delete->size());
 }
 
+void PersonalDataManager::ApplyProfileUseDatesFix() {
+  // Don't run if the fix has already been applied.
+  if (pref_service_->GetBoolean(prefs::kAutofillProfileUseDatesFixed))
+    return;
+
+  std::vector<AutofillProfile> profiles;
+  bool has_changed_data = false;
+  for (AutofillProfile* profile : web_profiles()) {
+    if (profile->use_date() == base::Time()) {
+      profile->set_use_date(base::Time::Now() - base::TimeDelta::FromDays(14));
+      has_changed_data = true;
+    }
+    profiles.push_back(*profile);
+  }
+
+  // Set the pref so that this fix is never run again.
+  pref_service_->SetBoolean(prefs::kAutofillProfileUseDatesFixed, true);
+
+  if (has_changed_data)
+    SetProfiles(&profiles);
+}
+
 }  // namespace autofill