Refactor List.setRange function.

sdk/lib/io/secure_socket.dart

Index: sdk/lib/io/secure_socket.dart
diff --git a/sdk/lib/io/secure_socket.dart b/sdk/lib/io/secure_socket.dart
index 41fdf59a81d0a1c8e77f8432e5a925d4c7978167..106001b5e816bf2c74211660a21a20119300b280 100644
--- a/sdk/lib/io/secure_socket.dart
+++ b/sdk/lib/io/secure_socket.dart
@@ -474,7 +474,8 @@ class _RawSecureSocket extends Stream<RawSocketEvent>
       bytes = buffer.free;
     }
     if (bytes > 0) {
-      buffer.data.setRange(buffer.start + buffer.length, bytes, data, offset);
+      int startIndex = buffer.start + buffer.length;
+      buffer.data.setRange(startIndex, startIndex + bytes, data, offset);
       buffer.length += bytes;
     }
     _writeEncryptedData();  // Tries to flush all pipeline stages.
@@ -660,9 +661,8 @@ class _RawSecureSocket extends Stream<RawSocketEvent>
         List<int> data = _socket.read(encrypted.free);
         if (data != null) {
           int bytes = data.length;
-          encrypted.data.setRange(encrypted.start + encrypted.length,
-                                  bytes,
-                                  data);
+          int startIndex = encrypted.start + encrypted.length;
+          encrypted.data.setRange(startIndex, startIndex + bytes, data);
           encrypted.length += bytes;
           progress = true;
         }