First pass at cleaning up html lib warnings from the analyzer.

sdk/lib/_internal/lib/constant_map.dart

Index: sdk/lib/_internal/lib/constant_map.dart
diff --git a/sdk/lib/_internal/lib/constant_map.dart b/sdk/lib/_internal/lib/constant_map.dart
index 398d37cf339db2f1e8d8035d6f7d6c5a569b1996..80b6705483699e4bf1989140f76b45bbcb587c8e 100644
--- a/sdk/lib/_internal/lib/constant_map.dart
+++ b/sdk/lib/_internal/lib/constant_map.dart
@@ -25,10 +25,10 @@ abstract class ConstantMap<K, V> implements Map<K, V> {
 // is shortcut by the compiler.
 class ConstantStringMap<K, V> extends ConstantMap<K, V>
                               implements _symbol_dev.EfficientLength {
-  final int length;
+  final int length = 0;

[Emily Fortuna, 2014/02/06 01:38:16]

not sure why fixing this file our problem, but it was an error that showed up
since html uses this file, so I'm fixing it anyway.

[blois, 2014/02/06 16:57:32]

I'd probably split this one out to a separate CL. Also to maintain current
behavior, length would be initialized to null (not sure what the intent is
though.

   // A constant map is backed by a JavaScript object.
-  final _jsObject;
-  final List<K> _keys;
+  final _jsObject = null;
+  final List<K> _keys = null;
 
   bool containsValue(V needle) {
     return values.any((V value) => value == needle);
@@ -62,7 +62,7 @@ class ConstantStringMap<K, V> extends ConstantMap<K, V>
 // This class has no constructor. This is on purpose since the instantiation
 // is shortcut by the compiler.
 class ConstantProtoMap<K, V> extends ConstantStringMap<K, V> {
-  final V _protoValue;
+  final V _protoValue = null;
 
   bool containsKey(Object key) {
     if (key == '__proto__') return true;
@@ -86,7 +86,7 @@ class _ConstantMapKeyIterable<K> extends IterableBase<K> {
 // is shortcut by the compiler.
 class GeneralConstantMap<K, V> extends ConstantMap<K, V> {
   // [_jsData] holds a key-value pair list.
-  final _jsData;
+  final _jsData = null;
 
   // We cannot create the backing map on creation since hashCode interceptors
   // have not been defined when constants are created.