Standardize StringToInt{,64} interface.

net/base/net_util.cc

Index: net/base/net_util.cc
diff --git a/net/base/net_util.cc b/net/base/net_util.cc
index 7ae4363d3b3778cb63fa6faa990def2c036d0723..180a90514aa7458631dcca52daec2820f9a3048f 100644
--- a/net/base/net_util.cc
+++ b/net/base/net_util.cc
@@ -1985,8 +1985,8 @@ void SetExplicitlyAllowedPorts(const std::string& allowed_ports) {
     if (i == size || allowed_ports[i] == kComma) {
       if (i > last) {
         int port;
-        base::StringToInt(allowed_ports.begin() + last,
-                          allowed_ports.begin() + i,
+        base::StringToInt(base::StringPiece(allowed_ports.begin() + last,
+                                            allowed_ports.begin() + i),
                           &port);
         ports.insert(port);
       }