Remove unused in-process pepper APIs

ppapi/thunk/ppb_scrollbar_api.h

Index: ppapi/thunk/ppb_scrollbar_api.h
diff --git a/ppapi/thunk/ppb_scrollbar_api.h b/ppapi/thunk/ppb_scrollbar_api.h
deleted file mode 100644
index 042eec8d3ecb8e2f30529579a8bd85c71c8bdd94..0000000000000000000000000000000000000000
--- a/ppapi/thunk/ppb_scrollbar_api.h
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright (c) 2011 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 PPAPI_THUNK_PPB_SCROLLBAR_API_H_
-#define PPAPI_THUNK_PPB_SCROLLBAR_API_H_
-
-#include "ppapi/c/dev/ppb_scrollbar_dev.h"
-
-namespace ppapi {
-namespace thunk {
-
-class PPB_Scrollbar_API {
- public:
-  virtual ~PPB_Scrollbar_API() {}
-
-  virtual uint32_t GetThickness() = 0;
-  virtual bool IsOverlay() = 0;
-  virtual uint32_t GetValue() = 0;
-  virtual void SetValue(uint32_t value) = 0;
-  virtual void SetDocumentSize(uint32_t size) = 0;
-  virtual void SetTickMarks(const PP_Rect* tick_marks, uint32_t count) = 0;
-  virtual void ScrollBy(PP_ScrollBy_Dev unit, int32_t multiplier) = 0;
-};
-
-}  // namespace thunk
-}  // namespace ppapi
-
-#endif  // PPAPI_THUNK_PPB_SCROLLBAR_API_H_