Extend net/base/parse_number.h for parsing of negative numbers, and determining if there was overflo

net/proxy/proxy_bypass_rules.cc

Index: net/proxy/proxy_bypass_rules.cc
diff --git a/net/proxy/proxy_bypass_rules.cc b/net/proxy/proxy_bypass_rules.cc
index eafaa98cc0593a82608be9d6d49ff99f6d99261b..963f6b0ec604b82961ba2980127600f13ff7b4ec 100644
--- a/net/proxy/proxy_bypass_rules.cc
+++ b/net/proxy/proxy_bypass_rules.cc
@@ -319,8 +319,8 @@ bool ProxyBypassRules::AddRuleFromStringInternal(
   std::string::size_type pos_colon = raw.rfind(':');
   port = -1;
   if (pos_colon != std::string::npos) {
-    if (!ParseNonNegativeDecimalInt(
-            base::StringPiece(raw.begin() + pos_colon + 1, raw.end()), &port) ||
+    if (!ParseInt32(base::StringPiece(raw.begin() + pos_colon + 1, raw.end()),
+                    ParseIntFormat::NON_NEGATIVE, &port) ||
         port > 0xFFFF) {
       return false;  // Port was invalid.
     }