Revert of [Sync] Eliminate verifier profile from sync_integration_tests

chrome/browser/sync/test/integration/extensions_helper.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/sync/test/integration/extensions_helper.h"
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 52 matching lines @@
 
 
 std::string InstallExtension(Profile* profile, int index) {
   return SyncExtensionHelper::GetInstance()->InstallExtension(
       profile,
       CreateFakeExtensionName(index),
       extensions::Manifest::TYPE_EXTENSION);
 }
 
 std::string InstallExtensionForAllProfiles(int index) {
-  std::string extension_id;
-  for (auto* profile : test()->GetAllProfiles()) {
-    extension_id = InstallExtension(profile, index);
-  }
-  return extension_id;
+  for (int i = 0; i < test()->num_clients(); ++i)
+    InstallExtension(test()->GetProfile(i), index);
+  return InstallExtension(test()->verifier(), index);
 }
 
 void UninstallExtension(Profile* profile, int index) {
   return SyncExtensionHelper::GetInstance()->UninstallExtension(
       profile, CreateFakeExtensionName(index));
 }
 
 std::vector<int> GetInstalledExtensions(Profile* profile) {
   std::vector<int> indices;
   std::vector<std::string> names =
@@ skipping 193 matching lines @@
   for (int i = 0; i < test()->num_clients(); ++i) {
     profiles.push_back(test()->GetProfile(i));
   }
 
   ExtensionsMatchChecker checker(profiles);
   checker.Wait();
   return !checker.TimedOut();
 }
 
 }  // namespace extensions_helper