Enable -Wdeprecated-register (except on CrOS and 32-bit Linux).

base/third_party/dmg_fp/g_fmt.cc

Index: base/third_party/dmg_fp/g_fmt.cc
diff --git a/base/third_party/dmg_fp/g_fmt.cc b/base/third_party/dmg_fp/g_fmt.cc
index bfa358d154c7d5cb2bead52329fc22af38687280..67c9f5736efa8bc186bc79971e6a46b8a709edde 100644
--- a/base/third_party/dmg_fp/g_fmt.cc
+++ b/base/third_party/dmg_fp/g_fmt.cc
@@ -27,10 +27,10 @@
 namespace dmg_fp {
 
  char *
-g_fmt(register char *b, double x)
+g_fmt(char *b, double x)
 {
-	register int i, k;
-	register char *s;
+	int i, k;
+	char *s;
 	int decpt, j, sign;
 	char *b0, *s0, *se;