Fix syntax error in BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index ff72a1d..43b7049 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -127,7 +127,7 @@
     "third_party/numerics/safe_conversions_impl.h",
     "third_party/numerics/safe_math.h",
     "third_party/numerics/safe_math_impl.h",
-  ],
+  ]
 }
 
 static_library("fdrm") {