Use checked-in .package file for building and testing

sdk/bin/dartfmt

Index: sdk/bin/dartfmt
diff --git a/sdk/bin/dartfmt b/sdk/bin/dartfmt
index ded1eac4fab6e8f50e2e2bda93d37c066b324ef8..a671c502f86e3ed095ad1cd045a5e335db6b2691 100755
--- a/sdk/bin/dartfmt
+++ b/sdk/bin/dartfmt
@@ -28,17 +28,4 @@ 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" "$@"