Standardize StringToInt{,64} interface.

net/http/http_chunked_decoder.cc

Index: net/http/http_chunked_decoder.cc
diff --git a/net/http/http_chunked_decoder.cc b/net/http/http_chunked_decoder.cc
index d5b16ddb6ea738ae4530e7d33b74ba06de66f336..917ac494752767496f16d49245a0c90f5c29ff1b 100644
--- a/net/http/http_chunked_decoder.cc
+++ b/net/http/http_chunked_decoder.cc
@@ -187,12 +187,14 @@ bool HttpChunkedDecoder::ParseChunkSize(const char* start, int len, int* out) {
 
   // Be more restrictive than HexStringToInt;
   // don't allow inputs with leading "-", "+", "0x", "0X"
-  if (base::StringPiece(start, len).find_first_not_of("0123456789abcdefABCDEF")
-      != base::StringPiece::npos)
+  base::StringPiece chunk_size(start, len);
+  if (chunk_size.find_first_not_of("0123456789abcdefABCDEF")
+      != base::StringPiece::npos) {
     return false;
+  }
 
   int parsed_number;
-  bool ok = base::HexStringToInt(start, start + len, &parsed_number);
+  bool ok = base::HexStringToInt(chunk_size, &parsed_number);
   if (ok && parsed_number >= 0) {
     *out = parsed_number;
     return true;