Ignore duplicate calls to safe browsing's last download finder SearchInProfile.

chrome/browser/safe_browsing/last_download_finder.cc

 // Copyright 2014 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 "chrome/browser/safe_browsing/last_download_finder.h"
 
 #include <algorithm>
 #include <functional>
 #include <utility>
 
@@ skipping 127 matching lines @@
 }
 
 void LastDownloadFinder::SearchInProfile(Profile* profile) {
   // Do not look in OTR profiles or in profiles that do not participate in
   // safe browsing.
   if (profile->IsOffTheRecord() ||
       !profile->GetPrefs()->GetBoolean(prefs::kSafeBrowsingEnabled)) {
     return;
   }
 
+  // Exit early if already processing this profile. This could happen if, for
+  // example, NOTIFICATION_PROFILE_ADDED arrives after construction while
+  // waiting for NOTIFICATION_HISTORY_LOADED.
+  if (std::find(profiles_.begin(), profiles_.end(), profile) !=
+      profiles_.end()) {
+    return;
+  }
+
   HistoryService* history_service =
       HistoryServiceFactory::GetForProfile(profile, Profile::IMPLICIT_ACCESS);
   // No history service is returned for profiles that do not save history.
   if (!history_service)
     return;
 
   profiles_.push_back(profile);
   if (history_service->BackendLoaded()) {
     history_service->QueryDownloads(
         base::Bind(&LastDownloadFinder::OnDownloadQuery,
@@ skipping 82 matching lines @@
       break;
     case chrome::NOTIFICATION_PROFILE_DESTROYED:
       AbandonSearchInProfile(content::Source<Profile>(source).ptr());
       break;
     default:
       break;
   }
 }
 
 }  // namespace safe_browsing