Remove unused in-process pepper APIs

ppapi/api/dev/ppp_scrollbar_dev.idl

Index: ppapi/api/dev/ppp_scrollbar_dev.idl
diff --git a/ppapi/api/dev/ppp_scrollbar_dev.idl b/ppapi/api/dev/ppp_scrollbar_dev.idl
deleted file mode 100644
index 28e9681b08d46d5250cd576f11cfa98e28841c94..0000000000000000000000000000000000000000
--- a/ppapi/api/dev/ppp_scrollbar_dev.idl
+++ /dev/null
@@ -1,31 +0,0 @@
-/* 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.
- */
-
-/**
- * This file defines the <code>PPP_Scrollbar_Dev</code> interface.
- */
-
-label Chrome {
-  M13 = 0.2,
-  M16 = 0.3
-};
-
-interface PPP_Scrollbar_Dev {
-  /**
-   *  Informs the instance that the scrollbar's value has changed.
-   */
-  void ValueChanged([in] PP_Instance instance,
-                    [in] PP_Resource scrollbar,
-                    [in] uint32_t value);
-
-  /**
-   * Informs the instance that the user has changed the system
-   * scrollbar style.
-   */
-  [version=0.3]
-  void OverlayChanged([in] PP_Instance instance,
-                      [in] PP_Resource scrollbar,
-                      [in] PP_Bool overlay);
-};