Issue 21071. Generate posix-style relative URIs.

pkg/analysis_server/lib/src/edit/edit_domain.dart

Index: pkg/analysis_server/lib/src/edit/edit_domain.dart
diff --git a/pkg/analysis_server/lib/src/edit/edit_domain.dart b/pkg/analysis_server/lib/src/edit/edit_domain.dart
index 128deed914e4b47d18bde7ad4d1506058fce1119..d39e55c831da11110ae15ba6611f98f2d013f3c7 100644
--- a/pkg/analysis_server/lib/src/edit/edit_domain.dart
+++ b/pkg/analysis_server/lib/src/edit/edit_domain.dart
@@ -309,7 +309,11 @@ class _RefactoringManager {
     if (kind == RefactoringKind.MOVE_FILE) {
       engine.AnalysisContext context = server.getAnalysisContext(file);
       Source source = server.getSource(file);
-      refactoring = new MoveFileRefactoring(searchEngine, context, source);
+      refactoring = new MoveFileRefactoring(
+          server.resourceProvider.pathContext,
+          searchEngine,
+          context,
+          source);
     }
     if (kind == RefactoringKind.RENAME) {
       List<AstNode> nodes = server.getNodesAtOffset(file, offset);