Remove deprecated classes and functions in Date.

runtime/lib/date.dart

Index: runtime/lib/date.dart
diff --git a/runtime/lib/date.dart b/runtime/lib/date.dart
index 1654da7f6eaa355eb364c4e29de91bfff6a1c7c9..d39fb8cf92fc4108caf1d4f1583de18d838fc8c2 100644
--- a/runtime/lib/date.dart
+++ b/runtime/lib/date.dart
@@ -3,18 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 // Dart core library.
 
-class TimeZoneImplementation implements TimeZone {
-  const TimeZoneImplementation.utc() : isUtc = true;
-  TimeZoneImplementation.local() : isUtc = false {}
-
-  bool operator ==(Object other) {
-    if (!(other is TimeZoneImplementation)) return false;
-    return isUtc == other.isUtc;
-  }
-
-  final bool isUtc;
-}
-
 // VM implementation of DateImplementation.
 class DateImplementation implements Date {
   static final int _SECONDS_YEAR_2035 = 2051222400;
@@ -33,17 +21,6 @@ class DateImplementation implements Date {
     if (value === null) throw new IllegalArgumentException();
   }
 
-  DateImplementation.withTimeZone(int years,
-                                  int month,
-                                  int day,
-                                  int hours,
-                                  int minutes,
-                                  int seconds,
-                                  int milliseconds,
-                                  TimeZone timeZone)
-      : this(years, month, day, hours, minutes, seconds, milliseconds,
-             timeZone.isUtc);
-
   DateImplementation.now()
       : _isUtc = true,
         value = _getCurrentMs() {
@@ -131,13 +108,6 @@ class DateImplementation implements Date {
     return new DateImplementation.fromEpoch(value, true);
   }
 
-  Date changeTimeZone(TimeZone targetTimeZone) {
-    if (targetTimeZone === null) {
-      targetTimeZone = new TimeZoneImplementation.local();
-    }
-    return new Date.fromEpoch(value, targetTimeZone.isUtc);
-  }
-
   String get timeZoneName() {
     if (isUtc()) return "UTC";
     return _timeZoneName(_equivalentSeconds(_secondsSinceEpoch));