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/preprocessor/Macro.h b/src/compiler/preprocessor/Macro.h
index b77e7bc..7662a9c 100644
--- a/src/compiler/preprocessor/Macro.h
+++ b/src/compiler/preprocessor/Macro.h
@@ -46,4 +46,5 @@
 typedef std::map<std::string, Macro> MacroSet;
 
 }  // namespace pp
+
 #endif  // COMPILER_PREPROCESSOR_MACRO_H_