Code cleanup (mostly io lib and some http lib).

sdk/lib/io/common.dart

Index: sdk/lib/io/common.dart
diff --git a/sdk/lib/io/common.dart b/sdk/lib/io/common.dart
index 94b932a2f28c4f854f3bba42f5565446f3c34ee7..ea355801147789b965aafbea16516674ce4680f8 100644
--- a/sdk/lib/io/common.dart
+++ b/sdk/lib/io/common.dart
@@ -16,9 +16,8 @@ const int _OSERROR_RESPONSE_ERROR_CODE = 1;
 const int _OSERROR_RESPONSE_MESSAGE = 2;
 
 // Functions used to receive exceptions from native ports.
-bool _isErrorResponse(response) {
-  return response is List && response[0] != _SUCCESS_RESPONSE;
-}
+bool _isErrorResponse(response) =>
+    response is List && response[0] != _SUCCESS_RESPONSE;
 
 /**
  * Returns an Exception or an Error
@@ -54,46 +53,46 @@ class OSError {
   /** Constant used to indicate that no OS error code is available. */
   static const int noErrorCode = -1;
 
+  /**
+    * Error message supplied by the operating system. null if no message is
+    * associated with the error.
+    */
+  final String message;
+
+  /**
+    * Error code supplied by the operating system. Will have the value
+    * [noErrorCode] if there is no error code associated with the error.
+    */
+  final int errorCode;
+
   /** Creates an OSError object from a message and an errorCode. */
-  const OSError([String this.message = "", int this.errorCode = noErrorCode]);
+  const OSError([this.message = "", this.errorCode = noErrorCode]);
 
   /** Converts an OSError object to a string representation. */
   String toString() {
     StringBuffer sb = new StringBuffer();
     sb.write("OS Error");
     if (!message.isEmpty) {
-      sb.write(": ");
-      sb.write(message);
+      sb..write(": ")
+        ..write(message);
       if (errorCode != noErrorCode) {
-        sb.write(", errno = ");
-        sb.write(errorCode.toString());
+        sb..write(", errno = ")
+          ..write(errorCode.toString());
       }
     } else if (errorCode != noErrorCode) {
-      sb.write(": errno = ");
-      sb.write(errorCode.toString());
+      sb..write(": errno = ")
+        ..write(errorCode.toString());
     }
     return sb.toString();
   }
-
-  /**
-    * Error message supplied by the operating system. null if no message is
-    * associated with the error.
-    */
-  final String message;
-
-  /**
-    * Error code supplied by the operating system. Will have the value
-    * [noErrorCode] if there is no error code associated with the error.
-    */
-  final int errorCode;
 }
 
 
 // Object for holding a buffer and an offset.
 class _BufferAndStart {
-  _BufferAndStart(List this.buffer, int this.start);
   List buffer;
   int start;
+  _BufferAndStart(this.buffer, this.start);
 }
 
 // Ensure that the input List can be serialized through a native port.