Remove unused in-process pepper APIs

ppapi/cpp/dev/selection_dev.h

-// Copyright (c) 2010 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_CPP_DEV_SELECTION_DEV_H_
-#define PPAPI_CPP_DEV_SELECTION_DEV_H_
-
-#include "ppapi/c/dev/ppp_selection_dev.h"
-#include "ppapi/cpp/instance_handle.h"
-
-namespace pp {
-
-class Var;
-
-// This class allows you to associate the PPP_Selection_Dev C-based interface
-// with an object. It registers as the global handler for handling the
-// PPP_Selection_Dev interface that the browser calls.
-//
-// You would typically use this either via inheritance on your instance:
-//   class MyInstance : public pp::Instance, public pp::Selection_Dev {
-//     class MyInstance() : pp::Selection_Dev(this) {
-//     }
-//     ...
-//   };
-//
-// or by composition:
-//   class MySelection : public pp::Selection_Dev {
-//     ...
-//   };
-//
-//   class MyInstance : public pp::Instance {
-//     MyInstance() : selection_(this) {
-//     }
-//
-//     MySelection selection_;
-//   };
-class Selection_Dev {
- public:
-  explicit Selection_Dev(Instance* instance);
-  virtual ~Selection_Dev();
-
-  // PPP_Selection_Dev functions exposed as virtual functions for you to
-  // override.
-  virtual Var GetSelectedText(bool html) = 0;
-
- private:
-  InstanceHandle associated_instance_;
-};
-
-}  // namespace pp
-
-#endif  // PPAPI_CPP_DEV_SELECTION_DEV_H_