PNaCl cleanup: Simplify error checking when opening temp files

components/nacl/renderer/plugin/temporary_file.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 COMPONENTS_NACL_RENDERER_PLUGIN_TEMPORARY_FILE_H_
 #define COMPONENTS_NACL_RENDERER_PLUGIN_TEMPORARY_FILE_H_
 
 #include <stdint.h>
 
 #include "base/files/file.h"
@@ skipping 24 matching lines @@
 // (or earlier -- immediately unlinked on POSIX systems).  The file is only
 // opened, once, but because both reading and writing are necessary (and in
 // different processes), the user should reset / seek back to the beginning
 // of the file between sessions.
 class TempFile {
  public:
   // Create a TempFile.
   TempFile(Plugin* plugin, PP_FileHandle handle);
   ~TempFile();
 
-  int32_t CheckValidity();
+  bool IsValid() { return file_handle_.IsValid(); }
   // Resets file position of the handle, for reuse.
   bool Reset();
 
   // Returns the current size of this file.
   int64_t GetLength();
 
   // Returns a handle to the file, transferring ownership of it.
   PP_FileHandle TakeFileHandle();
 
   // Returns a handle to the file, without transferring ownership of it.
   // This handle remains valid until the TempFile object is destroyed or
   // TakeFileHandle() is called.
   PP_FileHandle GetFileHandle();
 
  private:
   Plugin* plugin_;
   base::File file_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(TempFile);
 };
 
 }  // namespace plugin
 
 #endif  // COMPONENTS_NACL_RENDERER_PLUGIN_TEMPORARY_FILE_H_