Switch dartfmt in the SDK to run dart_style.

sdk/bin/dartfmt_sdk

 #!/bin/bash
-# Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+# Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-# Run dartanalyzer.dart on the Dart VM. This script assumes the Dart SDK's
-# directory structure.
+# Run dart_style/bin/format.dart on the Dart VM. This script assumes the Dart
+# SDK's directory structure.
 
 function follow_links() {
   file="$1"
   while [ -h "$file" ]; do
     # On Mac OS, readlink -f doesn't work.
     file="$(readlink "$file")"
   done
   echo "$file"
 }
 
 # Unlike $0, $BASH_SOURCE points to the absolute path of this file.
 PROG_NAME="$(follow_links "$BASH_SOURCE")"
 
 # Handle the case where dart-sdk/bin has been symlinked to.
 BIN_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
 SDK_DIR="$(cd "${BIN_DIR}/.." ; pwd -P)"
 
-SDK_ARG="--dart-sdk=$SDK_DIR"
-
-SNAPSHOT="$BIN_DIR/snapshots/dartanalyzer.dart.snapshot"
+SNAPSHOT="$BIN_DIR/snapshots/dartfmt.dart.snapshot"
 
 # We are running the snapshot in the built SDK.
 DART="$BIN_DIR/dart"
-exec "$DART" "$SNAPSHOT" "$SDK_ARG" "$@"
+exec "$DART" "$SNAPSHOT" "$@"