diff -up chromium-61.0.3163.79/base/numerics/safe_math_shared_impl.h.fixgcc3 chromium-61.0.3163.79/base/numerics/safe_math_shared_impl.h
--- chromium-61.0.3163.79/base/numerics/safe_math_shared_impl.h.fixgcc3	2017-09-06 16:30:15.898454585 -0400
+++ chromium-61.0.3163.79/base/numerics/safe_math_shared_impl.h	2017-09-06 16:30:27.570229539 -0400
@@ -21,8 +21,7 @@
 #if !defined(__native_client__) &&                         \
     ((defined(__clang__) &&                                \
       ((__clang_major__ > 3) ||                            \
-       (__clang_major__ == 3 && __clang_minor__ >= 4))) || \
-     (defined(__GNUC__) && __GNUC__ >= 5))
+       (__clang_major__ == 3 && __clang_minor__ >= 4))))
 #include "base/numerics/safe_math_clang_gcc_impl.h"
 #define BASE_HAS_OPTIMIZED_SAFE_MATH (1)
 #else