Use checked-in .package file for building and testing

sdk/bin/dartfmt

 #!/usr/bin/env bash
 # Copyright (c) 2013, 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 dart_style/bin/format.dart on the Dart VM. This script assumes the Dart
 # repo's directory structure.
 
 function follow_links() {
   file="$1"
@@ skipping 10 matching lines @@
 # Handle the case where dart-sdk/bin has been symlinked to.
 BIN_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
 SDK_DIR="$(cd "${BIN_DIR}/.." ; pwd -P)"
 
 DART="$BIN_DIR/dart"
 
 DART_ROOT="$(cd "${SDK_DIR}/.." ; pwd -P)"
 
 DARTFMT="$DART_ROOT/third_party/pkg_tested/dart_style/bin/format.dart"
 
-if [ -z "$DART_CONFIGURATION" ];
-then
-  DART_CONFIGURATION="ReleaseX64"
-fi
-
-if [[ `uname` == 'Darwin' ]]; then
-  BUILD_DIR="$DART_ROOT/xcodebuild/$DART_CONFIGURATION"
-else
-  BUILD_DIR="$DART_ROOT/out/$DART_CONFIGURATION"
-fi
-
-PACKAGE_ROOT="$BUILD_DIR/packages/"
-
-exec "$DART" "--package-root=$PACKAGE_ROOT" "$DARTFMT" "$@"
+exec "$DART" "$DARTFMT" "$@"