Fix PP_FileOpenFlags_Dev handling:

ppapi/tests/test_file_io.h

Index: ppapi/tests/test_file_io.h
diff --git a/ppapi/tests/test_file_io.h b/ppapi/tests/test_file_io.h
index 0140824443a533df87caf582d7a730cefe17fb31..a9f85f5030bcec0eb4f8c1adbd5ecb550f02ea59 100644
--- a/ppapi/tests/test_file_io.h
+++ b/ppapi/tests/test_file_io.h
@@ -9,6 +9,10 @@
 
 #include "ppapi/tests/test_case.h"
 
+namespace pp {
+class FileSystem_Dev;
+}  // namespace pp
+
 class TestFileIO : public TestCase {
  public:
   explicit TestFileIO(TestingInstance* instance) : TestCase(instance) {}
@@ -22,6 +26,14 @@ class TestFileIO : public TestCase {
   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_