Fix 'Unused local variable' hints in analyzer and analysis_server.

pkg/analysis_server/test/services/correction/fix_test.dart

Index: pkg/analysis_server/test/services/correction/fix_test.dart
diff --git a/pkg/analysis_server/test/services/correction/fix_test.dart b/pkg/analysis_server/test/services/correction/fix_test.dart
index fb582b7da4063961a7fe05512bbbe807ccbabc4e..e6d1604f4205fd7f261dade2ce6135d4bb54445f 100644
--- a/pkg/analysis_server/test/services/correction/fix_test.dart
+++ b/pkg/analysis_server/test/services/correction/fix_test.dart
@@ -79,7 +79,6 @@ bool test() {
 
   Position expectedPosition(String search) {
     int offset = resultCode.indexOf(search);
-    int length = getLeadingIdentifierLength(search);
     return new Position(testFile, offset);
   }
 
@@ -2317,7 +2316,6 @@ main() {
     List<Position> positions = <Position>[];
     for (String search in searchStrings) {
       int offset = resultCode.indexOf(search);
-      int length = getLeadingIdentifierLength(search);
       positions.add(new Position(testFile, offset));
     }
     return positions;