Remove VIEW_TYPE_NOTIFICATION since it's not used anymore.

chrome/browser/chrome_content_browser_client.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/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 2334 matching lines @@
     // Ensure that we are only granting extension preferences to URLs with
     // the correct scheme. Without this check, chrome-guest:// schemes used by
     // webview tags as well as hosts that happen to match the id of an
     // installed extension would get the wrong preferences.
     if (site_url.SchemeIs(extensions::kExtensionScheme)) {
       extension_webkit_preferences::SetPreferences(
           extension, view_type, web_prefs);
     }
   }
 
-  if (view_type == extensions::VIEW_TYPE_NOTIFICATION) {
-    web_prefs->allow_scripts_to_close_windows = true;
-  } else if (view_type == extensions::VIEW_TYPE_BACKGROUND_CONTENTS) {
+  if (view_type == extensions::VIEW_TYPE_BACKGROUND_CONTENTS) {
     // Disable all kinds of acceleration for background pages.
     // See http://crbug.com/96005 and http://crbug.com/96006
     web_prefs->force_compositing_mode = false;
     web_prefs->accelerated_compositing_enabled = false;
   }
 
 #if defined(OS_CHROMEOS)
   // Override the default of suppressing HW compositing for WebUI pages for the
   // file manager, which is implemented using WebUI but wants HW acceleration
   // for video decode & render.
@@ skipping 358 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome