Standardize StringToInt{,64} interface.

base/mac/mac_util.mm

Index: base/mac/mac_util.mm
diff --git a/base/mac/mac_util.mm b/base/mac/mac_util.mm
index 66fbf117b572877d0d0b3ef988d22b944869937f..2ba1a3031789ee737b4353315d9f498f0e1f268d 100644
--- a/base/mac/mac_util.mm
+++ b/base/mac/mac_util.mm
@@ -14,6 +14,7 @@
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/string_number_conversions.h"
+#include "base/string_piece.h"
 #include "base/sys_string_conversions.h"
 
 namespace base {
@@ -521,7 +522,9 @@ int DarwinMajorVersionInternal() {
   int darwin_major_version = 0;
   char* dot = strchr(uname_info.release, '.');
   if (dot) {
-    if (!base::StringToInt(uname_info.release, dot, &darwin_major_version)) {
+    if (!base::StringToInt(base::StringPiece(uname_info.release,
+                                             dot - uname_info.release),
+                           &darwin_major_version)) {
       dot = NULL;
     }
   }