ppapi: Cleanup class/struct forward declarations

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 <stdint.h>
 
 #include <string>
 
 #include "ppapi/tests/test_case.h"
 
 namespace pp {
-class FileIO;
 class FileSystem;
 }  // namespace pp
 
 class TestFileIO : public TestCase {
  public:
   explicit TestFileIO(TestingInstance* instance) : TestCase(instance) {}
 
   // TestCase implementation.
   virtual bool Init();
   virtual void RunTests(const std::string& filter);
@@ skipping 31 matching lines @@
   // are considered as valid input:
   // 1) INVALID_FLAG_COMBINATION
   // 2) (DONT_)?CREATE_IF_DOESNT_EXIST | (DONT_)?OPEN_IF_EXISTS |
   //    (DONT_)?TRUNCATE_IF_EXISTS
   std::string MatchOpenExpectations(pp::FileSystem* file_system,
                                     int32_t open_flags,
                                     int32_t expectations);
 };
 
 #endif  // PAPPI_TESTS_TEST_FILE_IO_H_