Add policy provider that would filter extensions/apps allowed on the

chrome/browser/extensions/extension_startup_browsertest.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 <stddef.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/base_switches.h"
@@ skipping 309 matching lines @@
 
 void DisableExtensionsExceptBrowserTest::SetUpCommandLine(
     base::CommandLine* command_line) {
   ExtensionBrowserTest::SetUpCommandLine(command_line);
   base::FilePath fp1(test_data_dir_.AppendASCII("app_dot_com_app/"));
   base::FilePath fp2(test_data_dir_.AppendASCII("app/"));
 
   command_line->AppendSwitchASCII(
       switches::kDisableExtensionsExcept,
       fp1.AsUTF8Unsafe() + "," + fp2.AsUTF8Unsafe());
+
+  command_line->AppendSwitch(switches::kNoErrorDialogs);
 }
 
 // Tests disabling all extensions except those listed
 // (--disable-extensions-except).
 IN_PROC_BROWSER_TEST_F(DisableExtensionsExceptBrowserTest,
                        DisableExtensionsExceptFlag) {
   EXPECT_FALSE(extension_service()->extensions_enabled());
 
   // Checks that the extensions loaded with the --disable-extensions-except flag
   // are enabled.
   bool is_app_dot_com_extension_enabled = false;
   bool is_app_test_extension_enabled = false;
   for (const scoped_refptr<const extensions::Extension>& extension :
        GetExtensionRegistry()->enabled_extensions()) {
     if (extension->name() == "App Dot Com: The App") {
       is_app_dot_com_extension_enabled = true;
     } else if (extension->name() == "App Test") {
       is_app_test_extension_enabled = true;
     } else {
       EXPECT_TRUE(
           extensions::Manifest::IsComponentLocation(extension->location()));
     }
   }
   EXPECT_TRUE(is_app_dot_com_extension_enabled);
   EXPECT_TRUE(is_app_test_extension_enabled);
 }