fix some errors in our SDK, mostly around numbers

tool/input_sdk/private/native_typed_data.dart

Index: tool/input_sdk/private/native_typed_data.dart
diff --git a/tool/input_sdk/private/native_typed_data.dart b/tool/input_sdk/private/native_typed_data.dart
index 4f159126f512cb0ff620ef6ddf03d117c17c0c55..b70021d1ed7bc54e3ba95f07fabc96c7f080c38f 100644
--- a/tool/input_sdk/private/native_typed_data.dart
+++ b/tool/input_sdk/private/native_typed_data.dart
@@ -10,7 +10,7 @@ library dart.typed_data.implementation;
 
 import 'dart:collection';
 import 'dart:_internal';
-import 'dart:_interceptors' show JSIndexable, JSUInt32, JSUInt31;
+import 'dart:_interceptors' show JSIndexable;
 import 'dart:_js_helper'
 show Creates, JavaScriptIndexingBehavior, JSName, Native, Null, Returns;
 import 'dart:_foreign_helper' show JS;
@@ -649,7 +649,7 @@ class NativeByteData extends NativeTypedData implements ByteData {
       _getUint16(byteOffset, Endianness.LITTLE_ENDIAN == endian);
 
   @JSName('getUint16')
-  @Returns('JSUInt31')
+  @Returns('int')
   int _getUint16(int byteOffset, [bool littleEndian]) native;
 
   /**
@@ -665,7 +665,7 @@ class NativeByteData extends NativeTypedData implements ByteData {
       _getUint32(byteOffset, Endianness.LITTLE_ENDIAN == endian);
 
   @JSName('getUint32')
-  @Returns('JSUInt32')
+  @Returns('int')
   int _getUint32(int byteOffset, [bool littleEndian]) native;
 
   /**
@@ -888,7 +888,7 @@ abstract class NativeTypedArrayOfDouble
     extends NativeTypedArray
         with ListMixin<double>, FixedLengthListMixin<double> {
 
-  int get length => JS('JSUInt32', '#.length', this);
+  int get length => JS('int', '#.length', this);
 
   double operator[](int index) {
     _checkIndex(index, length);
@@ -915,7 +915,7 @@ abstract class NativeTypedArrayOfInt
         with ListMixin<int>, FixedLengthListMixin<int>
     implements List<int> {
 
-  int get length => JS('JSUInt32', '#.length', this);
+  int get length => JS('int', '#.length', this);
 
   // operator[]() is not here since different versions have different return
   // types
@@ -1152,7 +1152,7 @@ class NativeUint16List extends NativeTypedArrayOfInt implements Uint16List {
 
   int operator[](int index) {
     _checkIndex(index, length);
-    return JS('JSUInt31', '#[#]', this, index);
+    return JS('int', '#[#]', this, index);
   }
 
   List<int> sublist(int start, [int end]) {
@@ -1192,7 +1192,7 @@ class NativeUint32List extends NativeTypedArrayOfInt implements Uint32List {
 
   int operator[](int index) {
     _checkIndex(index, length);
-    return JS('JSUInt32', '#[#]', this, index);
+    return JS('int', '#[#]', this, index);
   }
 
   List<int> sublist(int start, [int end]) {
@@ -1232,11 +1232,11 @@ class NativeUint8ClampedList
 
   Type get runtimeType => Uint8ClampedList;
 
-  int get length => JS('JSUInt32', '#.length', this);
+  int get length => JS('int', '#.length', this);
 
   int operator[](int index) {
     _checkIndex(index, length);
-    return JS('JSUInt31', '#[#]', this, index);
+    return JS('int', '#[#]', this, index);
   }
 
   List<int> sublist(int start, [int end]) {
@@ -1280,11 +1280,11 @@ class NativeUint8List extends NativeTypedArrayOfInt implements Uint8List {
 
   Type get runtimeType => Uint8List;
 
-  int get length => JS('JSUInt32', '#.length', this);
+  int get length => JS('int', '#.length', this);
 
   int operator[](int index) {
     _checkIndex(index, length);
-    return JS('JSUInt31', '#[#]', this, index);
+    return JS('int', '#[#]', this, index);
   }
 
   List<int> sublist(int start, [int end]) {