Move views vector icons from source_set to part of views target.

ui/views/resources/vector_icons/vector_icons.h.template

Index: ui/views/resources/vector_icons/vector_icons.h.template
diff --git a/ui/views/resources/vector_icons/vector_icons.h.template b/ui/views/resources/vector_icons/vector_icons.h.template
deleted file mode 100644
index 548c3f56e8db3e15f28c26eeca1e924f5cc492dd..0000000000000000000000000000000000000000
--- a/ui/views/resources/vector_icons/vector_icons.h.template
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright 2017 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.
-
-// vector_icons.h.template is used to generate vector_icons.h. Edit the former
-// rather than the latter.
-
-#ifndef UI_VIEWS_RESOURCES_VECTOR_ICONS_VECTOR_ICONS_H_
-#define UI_VIEWS_RESOURCES_VECTOR_ICONS_VECTOR_ICONS_H_
-
-#include "ui/views/views_export.h"
-
-namespace gfx {
-struct VectorIcon;
-}
-
-#define VECTOR_ICON_TEMPLATE_H(icon_name) \
-VIEWS_EXPORT extern const gfx::VectorIcon icon_name;
-
-namespace views {
-
-TEMPLATE_PLACEHOLDER
-
-}
-
-#undef VECTOR_ICON_TEMPLATE_H
-
-#endif  // UI_VIEWS_RESOURCES_VECTOR_ICONS_VECTOR_ICONS_H_