Fix include guards.

BUG=angle:733

Change-Id: I08b2c11c4831f1161c178c1842b10e807185aced
Reviewed-on: https://chromium-review.googlesource.com/230831
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/compiler/translator/ParseContext.h b/src/compiler/translator/ParseContext.h
index 85b537f..90b209b 100644
--- a/src/compiler/translator/ParseContext.h
+++ b/src/compiler/translator/ParseContext.h
@@ -3,8 +3,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-#ifndef _PARSER_HELPER_INCLUDED_
-#define _PARSER_HELPER_INCLUDED_
+#ifndef COMPILER_TRANSLATOR_PARSECONTEXT_H_
+#define COMPILER_TRANSLATOR_PARSECONTEXT_H_
 
 #include "compiler/translator/Compiler.h"
 #include "compiler/translator/Diagnostics.h"
@@ -169,4 +169,4 @@
 int PaParseStrings(size_t count, const char* const string[], const int length[],
                    TParseContext* context);
 
-#endif // _PARSER_HELPER_INCLUDED_
+#endif // COMPILER_TRANSLATOR_PARSECONTEXT_H_