pkg/compiler: fix imports

pkg/compiler/lib/src/platform_configuration.dart

 // Copyright (c) 2015, the Fletch 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.md file.
 
 /// Tools for loading and parsing platform-configuration files.
 library plaform_configuration;
 
 import "dart:async";
+
 import "package:charcode/ascii.dart";
+
 import "../compiler_new.dart" as api;
 
 /// Parses an Ini-like format.
 ///
 /// Sections are initialized with a name enclosed in brackets.
 /// Each section contain zero or more properties of the form "name:value".
 /// Empty lines are ignored.
 /// Lines starting with # are ignored.
 /// Duplicate names are not allowed.
 /// All keys and values will be passed through [String.trim].
@@ skipping 114 matching lines @@
   return provider.readFromUri(location).then((contents) {
     if (contents is String) {
       contents = contents.codeUnits;
     }
     return libraryMappings(
         parseIni(contents,
             allowedSections: allowedSections, sourceUri: location),
         location);
   });
 }