Remove unused PPB_View_Dev

ppapi/cpp/dev/view_dev.h

-// 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.
-
-#ifndef PPAPI_CPP_DEV_VIEW_DEV_H_
-#define PPAPI_CPP_DEV_VIEW_DEV_H_
-
-#include "ppapi/cpp/view.h"
-
-namespace pp {
-
-// ViewDev is a version of View that exposes under-development APIs related to
-// HiDPI
-class ViewDev : public View {
- public:
-  ViewDev() : View() {}
-  ViewDev(const View& other) : View(other) {}
-
-  virtual ~ViewDev() {}
-
-  /// GetDeviceScale returns the scale factor between device pixels and DIPs
-  /// (also known as logical pixels or UI pixels on some platforms). This allows
-  /// the developer to render their contents at device resolution, even as
-  /// coordinates / sizes are given in DIPs through the API.
-  ///
-  /// Note that the coordinate system for Pepper APIs is DIPs. Also note that
-  /// one DIP might not equal one CSS pixel - when page scale/zoom is in effect.
-  ///
-  /// @return A <code>float</code> value representing the number of device
-  /// pixels per DIP.
-  float GetDeviceScale() const;
-
-  /// GetCSSScale returns the scale factor between DIPs and CSS pixels. This
-  /// allows proper scaling between DIPs - as sent via the Pepper API - and CSS
-  /// pixel coordinates used for Web content.
-  ///
-  /// @return A <code>float</code> value representing the number of DIPs per CSS
-  /// pixel.
-  float GetCSSScale() const;
-};
-
-}  // namespace pp
-
-#endif  // PPAPI_CPP_DEV_VIEW_DEV_H_