Tighten up a bunch of types in test.dart.

tools/testing/dart/utils.dart

Index: tools/testing/dart/utils.dart
diff --git a/tools/testing/dart/utils.dart b/tools/testing/dart/utils.dart
index a65c4b48ed34107734004441f5cb3e5479aaaee2..b80f4bcd0504339634ef61eb566c93648ef7d6c9 100644
--- a/tools/testing/dart/utils.dart
+++ b/tools/testing/dart/utils.dart
@@ -24,7 +24,7 @@ class DebugLogger {
   /**
    * If [path] was null, the DebugLogger will write messages to stdout.
    */
-  static init(Path path, {append: false}) {
+  static void init(Path path, {bool append: false}) {
     if (path != null) {
       var mode = append ? FileMode.APPEND : FileMode.WRITE;
       _sink = new File(path.toNativePath()).openWrite(mode: mode);
@@ -180,7 +180,7 @@ String decodeUtf8(List<int> bytes) {
 
 class Locations {
   static String getBrowserLocation(
-      String browserName, Map globalConfiguration) {
+      String browserName, Map<String, String> globalConfiguration) {
     var location = globalConfiguration[browserName];
     if (location != null && location != '') {
       return location;
@@ -306,7 +306,8 @@ class UniqueObject {
   final int _hashCode;
 
   int get hashCode => _hashCode;
-  operator ==(other) => other is UniqueObject && _hashCode == other._hashCode;
+  operator ==(Object other) =>
+      other is UniqueObject && _hashCode == other._hashCode;
 
   UniqueObject() : _hashCode = ++_nextId;
 }