Fix PP_FileOpenFlags_Dev handling:

ppapi/tests/test_file_io.h

 // 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 PAPPI_TESTS_TEST_FILE_IO_H_
 #define PAPPI_TESTS_TEST_FILE_IO_H_
 
 #include <string>
 
 #include "ppapi/tests/test_case.h"
 
+namespace pp {
+class FileSystem_Dev;
+}  // namespace pp
+
 class TestFileIO : public TestCase {
  public:
   explicit TestFileIO(TestingInstance* instance) : TestCase(instance) {}
 
   // TestCase implementation.
   virtual bool Init();
   virtual void RunTest();
 
  private:
   std::string TestOpen();
   std::string TestReadWriteSetLength();
   std::string TestTouchQuery();
   std::string TestAbortCalls();
+
+  // Helper method used by TestOpen().
+  std::string MatchOpenExpectation(pp::FileSystem_Dev* file_system,
+                                   size_t open_flags,
+                                   bool invalid_combination,
+                                   bool create_if_not_exist,
+                                   bool open_if_exist,
+                                   bool truncate_if_exist);
 };
 
 #endif  // PAPPI_TESTS_TEST_FILE_IO_H_