Remove deprecated classes and functions in Date.

lib/compiler/implementation/lib/mockimpl.dart

Index: lib/compiler/implementation/lib/mockimpl.dart
diff --git a/lib/compiler/implementation/lib/mockimpl.dart b/lib/compiler/implementation/lib/mockimpl.dart
index 1e8135c3e1d205d92cba37d104eb5d99e7cacd46..4797f9435f24d74e0c51cb85e44562697c5f9c85 100644
--- a/lib/compiler/implementation/lib/mockimpl.dart
+++ b/lib/compiler/implementation/lib/mockimpl.dart
@@ -166,18 +166,6 @@ class StringBase {
   }
 }
 
-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;
-}
-
 class DateImplementation implements Date {
   final int value;
   final bool _isUtc;
@@ -196,17 +184,6 @@ class DateImplementation implements Date {
     _asJs();
   }
 
-  DateImplementation.withTimeZone(int years,
-                                  int month,
-                                  int day,
-                                  int hours,
-                                  int minutes,
-                                  int seconds,
-                                  int milliseconds,
-                                  TimeZoneImplementation timeZone)
-      : this(years, month, day, hours, minutes, seconds, milliseconds,
-             timeZone.isUtc);
-
   DateImplementation.now()
       : _isUtc = false,
         value = Primitives.dateNow() {
@@ -296,13 +273,6 @@ 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 Primitives.getTimeZoneName(this);