Fix analysis hints. (flutter#13)

Also get rid of an outdated util method.

lib/src/chain.dart

@@ -77,8 +77,7 @@ class Chain implements StackTrace {
         };
       }
 
-      // TODO(rnystrom): Remove this cast if runZoned() gets a generic type.
-      return runZoned(callback, onError: newOnError) as dynamic/*=T*/;
+      return runZoned(callback, onError: newOnError);
     }
 
     var spec = new StackZoneSpecification(onError);
@@ -207,7 +206,7 @@ class Chain implements StackTrace {
     // padding is consistent across all traces.
     return traces.map((trace) {
       return trace.frames.map((frame) {
-        return '${padRight(frame.location, longest)}  ${frame.member}\n';
+        return '${frame.location.padRight(longest)}  ${frame.member}\n';
       }).join();
     }).join(chainGap);
   }

lib/src/trace.dart

@@ -291,7 +291,7 @@ class Trace implements StackTrace {
     // Print out the stack trace nicely formatted.
     return frames.map((frame) {
       if (frame is UnparsedFrame) return "$frame\n";
-      return '${padRight(frame.location, longest)}  ${frame.member}\n';
+      return '${frame.location.padRight(longest)}  ${frame.member}\n';
     }).join();
   }
 }

lib/src/utils.dart

@@ -2,26 +2,10 @@
 // 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 'package:path/path.dart' as p;
-
 /// The line used in the string representation of stack chains to represent
 /// the gap between traces.
 const chainGap = '===== asynchronous gap ===========================\n';
 
 // TODO(nweiz): When cross-platform imports work, use them to set this.
 /// Whether we're running in a JS context.
 final bool inJS = 0.0 is int;
-
-/// Returns [string] with enough spaces added to the end to make it [length]
-/// characters long.
-String padRight(String string, int length) {
-  if (string.length >= length) return string;
-
-  var result = new StringBuffer();
-  result.write(string);
-  for (var i = 0; i < length - string.length; i++) {
-    result.write(' ');
-  }
-
-  return result.toString();
-}

lib/src/vm_trace.dart

@@ -3,7 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'frame.dart';
-import 'utils.dart';
 
 /// An implementation of [StackTrace] that emulates the behavior of the VM's
 /// implementation.
@@ -19,7 +18,7 @@ class VMTrace implements StackTrace {
   String toString() {
     var i = 1;
     return frames.map((frame) {
-      var number = padRight("#${i++}", 8);
+      var number = "#${i++}".padRight(8);
       var member = frame.member
           .replaceAllMapped(new RegExp(r"[^.]+\.<async>"),
               (match) => "${match[1]}.<${match[1]}_async_body>")

pubspec.yaml

@@ -7,7 +7,7 @@ name: stack_trace
 #
 # When the major version is upgraded, you *must* update that version constraint
 # in pub to stay in sync with this.
-version: 1.6.7
+version: 1.6.8-dev
 author: "Dart Team <misc@dartlang.org>"
 homepage: https://github.com/dart-lang/stack_trace
 description: >