Remove the unused parts of PPB_PDF

components/pdf/renderer/ppb_pdf_impl.h

-// Copyright 2014 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 COMPONENT_PDF_RENDERER_PPB_PDF_IMPL_H_
-#define COMPONENT_PDF_RENDERER_PPB_PDF_IMPL_H_
-
-#include "ppapi/c/pp_instance.h"
-
-struct PPB_PDF;
-
-namespace pdf {
-
-class PPB_PDF_Impl {
- public:
-  class PrintClient {
-   public:
-    virtual ~PrintClient() {}
-
-    // Returns whether printing is enabled for the plugin instance identified by
-    // |instance_id|.
-    virtual bool IsPrintingEnabled(PP_Instance instance_id) = 0;
-
-    // Invokes the "Print" command for the plugin instance identified by
-    // |instance_id|. Returns whether the "Print" command was issued or not.
-    virtual bool Print(PP_Instance instance_id) = 0;
-  };
-
-  // Returns a pointer to the interface implementing PPB_PDF that is exposed
-  // to the plugin.
-  static const PPB_PDF* GetInterface();
-
-  // Invokes the "Print" command for the given instance as if the user right
-  // clicked on it and selected "Print". Returns if the "Print" command was
-  // issued or not.
-  static bool InvokePrintingForInstance(PP_Instance instance);
-
-  // The caller retains the ownership of |print_client|. The client is
-  // allowed to be set only once, and when set, the client must outlive the
-  // PPB_PDF_Impl instance.
-  static void SetPrintClient(PrintClient* print_client);
-};
-
-}  // namespace pdf
-
-#endif  // COMPONENT_PDF_RENDERER_PPB_PDF_IMPL_H_