[Extensions] Clean up renderer channel-related code

chrome/common/extensions/features/feature_util.h

Index: chrome/common/extensions/features/feature_util.h
diff --git a/chrome/common/extensions/features/feature_util.h b/chrome/common/extensions/features/feature_util.h
deleted file mode 100644
index e4c1fee4e9c90e8dacfa5be3014b241d1bbbb2a7..0000000000000000000000000000000000000000
--- a/chrome/common/extensions/features/feature_util.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2015 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 CHROME_COMMON_EXTENSIONS_FEATURES_FEATURE_UTIL_H_
-#define CHROME_COMMON_EXTENSIONS_FEATURES_FEATURE_UTIL_H_
-
-namespace extensions {
-namespace feature_util {
-
-// Returns true if service workers are enabled for extension schemes.
-// TODO(lazyboy): Remove this function once extension Service Workers
-// are enabled by default for a while.
-bool ExtensionServiceWorkersEnabled();
-
-}  // namespace feature_util
-}  // namespace extensions
-
-#endif  // CHROME_COMMON_EXTENSIONS_FEATURES_FEATURE_UTIL_H_