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

sdk/lib/io/file.dart

Index: sdk/lib/io/file.dart
diff --git a/sdk/lib/io/file.dart b/sdk/lib/io/file.dart
index 7369640f527fac04342ff03386f0152a9da9e353..d48a367005e572cd5daaf9959f83ff27c02e89ac 100644
--- a/sdk/lib/io/file.dart
+++ b/sdk/lib/io/file.dart
@@ -16,8 +16,9 @@ class FileMode {
   /// The [FileMode] for opening a file for reading a file and writing to the
   /// end of it. If the file does not exist, it will be created.
   static const APPEND = const FileMode._internal(2);
-  const FileMode._internal(int this._mode);
   final int _mode;
+
+  const FileMode._internal(this._mode);
 }
 
 /// The [FileMode] for opening a file only for reading.
@@ -564,9 +565,7 @@ class FileSystemException implements IOException {
   final String message;
   final String path;
   final OSError osError;
-  const FileSystemException([String this.message = "",
-                             String this.path = "",
-                             OSError this.osError]);
+  const FileSystemException([this.message = "", this.path = "", this.osError]);
 
   String toString() {
     StringBuffer sb = new StringBuffer();