Removed fixed dependencies

packages/dart_style/lib/src/debug.dart

Index: packages/dart_style/lib/src/debug.dart
diff --git a/packages/dart_style/lib/src/debug.dart b/packages/dart_style/lib/src/debug.dart
index 5d0eb2b7142c5c3ad7557138cca7551552eb3682..b3ca65fc13aa6c6132c4e91e1145c61dd5867f86 100644
--- a/packages/dart_style/lib/src/debug.dart
+++ b/packages/dart_style/lib/src/debug.dart
@@ -71,10 +71,10 @@ void dumpChunks(int start, List<Chunk> chunks) {
 
   // Show the spans as vertical bands over their range (unless there are too
   // many).
-  var spans = new Set();
-  addSpans(chunks) {
+  var spanSet = new Set<Span>();
+  addSpans(List<Chunk> chunks) {
     for (var chunk in chunks) {
-      spans.addAll(chunk.spans);
+      spanSet.addAll(chunk.spans);
 
       if (chunk.isBlock) addSpans(chunk.block.chunks);
     }
@@ -82,15 +82,14 @@ void dumpChunks(int start, List<Chunk> chunks) {
 
   addSpans(chunks);
 
-  spans = spans.toList();
-
+  var spans = spanSet.toList();
   var rules =
       chunks.map((chunk) => chunk.rule).where((rule) => rule != null).toSet();
 
-  var rows = [];
+  var rows = <List<String>>[];
 
   addChunk(List<Chunk> chunks, String prefix, int index) {
-    var row = [];
+    var row = <String>[];
     row.add("$prefix$index:");
 
     var chunk = chunks[index];