Refactors GetDeviceIdentifier()

base/ios/device_util.h

Index: base/ios/device_util.h
diff --git a/base/ios/device_util.h b/base/ios/device_util.h
index 93100da4b6c3ef37e09a525ccb56c01c23d9fb21..4e69efc39ca9d7f666501782698ee1507ec8dbcd 100644
--- a/base/ios/device_util.h
+++ b/base/ios/device_util.h
@@ -72,6 +72,12 @@ std::string GetRandomId();
 // something that should be anonymous, you should probably pass NULL.
 std::string GetDeviceIdentifier(const char* salt);
 
+// Returns a hashed version of |in_string| using |salt| (which must not
+// zero-length). Different salt values should result in differently hashed
+// strings.
+std::string GetSaltedString(const std::string& in_string,
+                            const std::string& salt);
+
 }  // namespace device_util
 }  // namespace ios