Changed previews component to be a layered component.

components/previews/previews_experiments.h

Index: components/previews/previews_experiments.h
diff --git a/components/previews/previews_experiments.h b/components/previews/previews_experiments.h
deleted file mode 100644
index 7fff9c476a9b0e332ae4c29b02335781ac4f72a2..0000000000000000000000000000000000000000
--- a/components/previews/previews_experiments.h
+++ /dev/null
@@ -1,23 +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_PREVIEWS_PREVIEWS_EXPERIMENTS_H_
-#define COMPONENTS_PREVIEWS_PREVIEWS_EXPERIMENTS_H_
-
-namespace previews {
-
-// Returns true if any client-side previews experiment is active.
-bool IsIncludedInClientSidePreviewsExperimentsFieldTrial();
-
-// Returns true if the field trial that should enable offline pages for
-// prohibitvely slow networks is active.
-bool IsOfflinePreviewsEnabled();
-
-// Sets the appropriate state for field trial and variations to imitate the
-// offline pages field trial.
-bool EnableOfflinePreviewsForTesting();
-
-}  // namespace previews
-
-#endif  // COMPONENTS_PREVIEWS_PREVIEWS_EXPERIMENTS_H_