update dependencies to use url style paths

pkg/dev_compiler/lib/src/compiler/command.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:io';
 import 'package:analyzer/src/command_line/arguments.dart'
     show
         defineAnalysisArguments,
         filterUnknownArguments,
         ignoreUnrecognizedFlagsFlag;
@@ skipping 203 matching lines @@
 }
 
 String _moduleForLibrary(
     String moduleRoot, Source source, CompilerOptions compilerOpts) {
   if (source is InSummarySource) {
     var summaryPath = source.summaryPath;
     var ext = '.${compilerOpts.summaryExtension}';
     if (path.isWithin(moduleRoot, summaryPath) && summaryPath.endsWith(ext)) {
       var buildUnitPath =
           summaryPath.substring(0, summaryPath.length - ext.length);
-      return path.relative(buildUnitPath, from: moduleRoot);
+      return path.url
+          .joinAll(path.split(path.relative(buildUnitPath, from: moduleRoot)));
     }
 
     _usageException('Imported file ${source.uri} is not within the module root '
         'directory $moduleRoot');
   }
 
   _usageException(
       'Imported file "${source.uri}" was not found as a summary or source '
       'file. Please pass in either the summary or the source file '
       'for this import.');
@@ skipping 19 matching lines @@
 }
 
 void _usageException(String message) {
   throw new UsageException(message, _usageMessage);
 }
 
 /// Thrown when the input source code has errors.
 class CompileErrorException implements Exception {
   toString() => '\nPlease fix all errors before compiling (warnings are okay).';
 }