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

net/base/sdch_manager.cc

Index: net/base/sdch_manager.cc
diff --git a/net/base/sdch_manager.cc b/net/base/sdch_manager.cc
index 435977237d83d4856008b9c442bf3946f3c36091..af90ee55209e499c5866c8e47f3164ac468bea43 100644
--- a/net/base/sdch_manager.cc
+++ b/net/base/sdch_manager.cc
@@ -382,7 +382,7 @@ SdchProblemCode SdchManager::AddSdchDictionary(
         expiration = base::Time::Now() + base::TimeDelta::FromSeconds(seconds);
       } else if (name == "port") {
         int port;
-        if (ParseNonNegativeDecimalInt(value, &port))
+        if (ParseNonNegativeInteger(value, &port))
           ports.insert(port);
       }
     }