Rename the shared_impl resource files to give them more regular names.

ppapi/shared_impl/instance_impl.h

Index: ppapi/shared_impl/instance_impl.h
===================================================================
--- ppapi/shared_impl/instance_impl.h	(revision 113419)
+++ ppapi/shared_impl/instance_impl.h	(working copy)
@@ -1,24 +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_SHARED_IMPL_INSTANCE_IMPL_H_
-#define PPAPI_SHARED_IMPL_INSTANCE_IMPL_H_
-
-#include "ppapi/c/pp_stdint.h"
-#include "ppapi/shared_impl/ppapi_shared_export.h"
-
-namespace ppapi {
-
-class PPAPI_SHARED_EXPORT InstanceImpl {
- public:
-  virtual ~InstanceImpl();
-
-  // Error checks the given resquest to Request[Filtering]InputEvents. Returns
-  // PP_OK if the given classes are all valid, PP_ERROR_NOTSUPPORTED if not.
-  int32_t ValidateRequestInputEvents(bool is_filtering, uint32_t event_classes);
-};
-
-}  // namespace ppapi
-
-#endif  // PPAPI_SHARED_IMPL_INSTANCE_IMPL_H_