Switch dartfmt in the SDK to run dart_style.

sdk/bin/dartfmt_sdk

Index: sdk/bin/dartfmt_sdk
diff --git a/sdk/bin/dartanalyzer_sdk b/sdk/bin/dartfmt_sdk
similarity index 69%
copy from sdk/bin/dartanalyzer_sdk
copy to sdk/bin/dartfmt_sdk
index cc49a5c8293165d323178d90213af08683af46d2..0a9cbefcb3a6320961b4b044a8683e916533bd45 100755
--- a/sdk/bin/dartanalyzer_sdk
+++ b/sdk/bin/dartfmt_sdk
@@ -1,10 +1,10 @@
 #!/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="$1"
@@ -22,10 +22,8 @@ PROG_NAME="$(follow_links "$BASH_SOURCE")"
 BIN_DIR="$(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" "$SNAPSHOT" "$@"