Revert of Make extensions DSE persistent in browser prefs

components/search_engines/search_engines_test_util.h

Index: components/search_engines/search_engines_test_util.h
diff --git a/components/search_engines/search_engines_test_util.h b/components/search_engines/search_engines_test_util.h
deleted file mode 100644
index 2d4496f55a47be22c30d72d4e73bdb8e37440da3..0000000000000000000000000000000000000000
--- a/components/search_engines/search_engines_test_util.h
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright 2016 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.
-
-#ifndef COMPONENTS_SEARCH_ENGINES_SEARCH_ENGINES_TEST_UTIL_H_
-#define COMPONENTS_SEARCH_ENGINES_SEARCH_ENGINES_TEST_UTIL_H_
-
-#include <memory>
-#include <string>
-
-struct TemplateURLData;
-
-namespace sync_preferences {
-class TestingPrefServiceSyncable;
-}
-
-// Generates a TemplateURLData structure useful for tests filled with values
-// autogenerated from |provider_name|.
-std::unique_ptr<TemplateURLData> GenerateDummyTemplateURLData(
-    const std::string& provider_name);
-
-// Checks that the two TemplateURLs are similar. Does not check the id, the
-// date_created or the last_modified time.  Neither pointer should be null.
-void ExpectSimilar(const TemplateURLData* expected,
-                   const TemplateURLData* actual);
-
-// Writes default search engine |extension_data| into the extension-controlled
-// preference in |prefs|.
-void SetExtensionDefaultSearchInPrefs(
-    sync_preferences::TestingPrefServiceSyncable* prefs,
-    const TemplateURLData& extension_data);
-
-// Removes the extension-controlled default search engine preference from
-// |prefs|.
-void RemoveExtensionDefaultSearchFromPrefs(
-    sync_preferences::TestingPrefServiceSyncable* prefs);
-
-#endif  // COMPONENTS_SEARCH_ENGINES_SEARCH_ENGINES_TEST_UTIL_H_