Warn users about potentially unwanted downloads.

chrome/browser/download/chrome_download_manager_delegate.cc

 // Copyright (c) 2012 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/download/chrome_download_manager_delegate.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 507 matching lines @@
   if (!item || (item->GetState() != DownloadItem::IN_PROGRESS))
     return;
 
   VLOG(2) << __FUNCTION__ << "() download = " << item->DebugString(false)
           << " verdict = " << result;
   // We only mark the content as being dangerous if the download's safety state
   // has not been set to DANGEROUS yet.  We don't want to show two warnings.
   if (item->GetDangerType() == content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS ||
       item->GetDangerType() ==
       content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT) {
+    content::DownloadDangerType danger_type =
+        content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS;
     switch (result) {
       case DownloadProtectionService::SAFE:
         // Do nothing.
         break;
       case DownloadProtectionService::DANGEROUS:
-        item->OnContentCheckCompleted(
-            content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT);
+        danger_type = content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT;
         break;
       case DownloadProtectionService::UNCOMMON:
-        item->OnContentCheckCompleted(
-            content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT);
+        danger_type = content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT;
         break;
       case DownloadProtectionService::DANGEROUS_HOST:
-        item->OnContentCheckCompleted(
-            content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST);
+        danger_type = content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST;
+        break;
+      case DownloadProtectionService::POTENTIALLY_UNWANTED:
+        danger_type = content::DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED;
         break;
     }
+
+    if (danger_type != content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS)
+      item->OnContentCheckCompleted(danger_type);
   }
 
   SafeBrowsingState* state = static_cast<SafeBrowsingState*>(
       item->GetUserData(&safe_browsing_id));
   state->SetVerdict(result);
 }
 
 // content::NotificationObserver implementation.
 void ChromeDownloadManagerDelegate::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK(type == chrome::NOTIFICATION_CRX_INSTALLER_DONE);
 
   registrar_.Remove(this,
                     chrome::NOTIFICATION_CRX_INSTALLER_DONE,
                     source);
 
   scoped_refptr<extensions::CrxInstaller> installer =
       content::Source<extensions::CrxInstaller>(source).ptr();
   content::DownloadOpenDelayedCallback callback =
       crx_installers_[installer.get()];
   crx_installers_.erase(installer.get());
   callback.Run(installer->did_handle_successfully());
 }