Remove several references to JavaFile

pkg/analyzer/lib/source/embedder.dart

Index: pkg/analyzer/lib/source/embedder.dart
diff --git a/pkg/analyzer/lib/source/embedder.dart b/pkg/analyzer/lib/source/embedder.dart
index ffcbfed592f6aaff656a66ba4482dfd068c9c4d9..7c9ab54e595d4aab5ca24947019b0fab4e499e18 100644
--- a/pkg/analyzer/lib/source/embedder.dart
+++ b/pkg/analyzer/lib/source/embedder.dart
@@ -7,6 +7,7 @@ library analyzer.source.embedder;
 
 import 'dart:collection' show HashMap;
 import 'dart:core' hide Resource;
+import 'dart:io' as io;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/source/package_map_provider.dart'
@@ -75,7 +76,7 @@ class EmbedderSdk extends AbstractDartSdk {
       srcPath = library.path;
     } else {
       String libraryPath = library.path;
-      int index = libraryPath.lastIndexOf(JavaFile.separator);
+      int index = libraryPath.lastIndexOf(io.Platform.pathSeparator);
       if (index == -1) {
         index = libraryPath.lastIndexOf('/');
         if (index == -1) {
@@ -85,7 +86,7 @@ class EmbedderSdk extends AbstractDartSdk {
       String prefix = libraryPath.substring(0, index + 1);
       srcPath = '$prefix$relativePath';
     }
-    String filePath = srcPath.replaceAll('/', JavaFile.separator);
+    String filePath = srcPath.replaceAll('/', io.Platform.pathSeparator);
     try {
       JavaFile file = new JavaFile(filePath);
       return new FileBasedSource(file, parseUriWithException(dartUri));