Port the remaining of dart:coreimpl to the unified corelib.

lib/compiler/implementation/lib/coreimpl.dartp

Index: lib/compiler/implementation/lib/coreimpl.dartp
diff --git a/lib/compiler/implementation/lib/coreimpl.dartp b/lib/compiler/implementation/lib/coreimpl.dartp
deleted file mode 100644
index a906769f28eaa6e05966cafba8c1b68f10393791..0000000000000000000000000000000000000000
--- a/lib/compiler/implementation/lib/coreimpl.dartp
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// Patch file for dart:core's Date class.
-
-patch class DateImplementation {
-  patch DateImplementation(int years,
-                           [int month = 1,
-                            int day = 1,
-                            int hour = 0,
-                            int minute = 0,
-                            int second = 0,
-                            int millisecond = 0,
-                            bool isUtc = false])
-      : this.isUtc = checkNull(isUtc),
-        millisecondsSinceEpoch = Primitives.valueFromDecomposedDate(
-            years, month, day, hour, minute, second, millisecond, isUtc) {
-    Primitives.lazyAsJsDate(this);
-  }
-
-  patch DateImplementation.now()
-      : isUtc = false,
-        millisecondsSinceEpoch = Primitives.dateNow() {
-    Primitives.lazyAsJsDate(this);
-  }
-
-  patch String get timeZoneName() {
-    if (isUtc) return "UTC";
-    return Primitives.getTimeZoneName(this);
-  }
-
-  patch Duration get timeZoneOffset() {
-    if (isUtc) return new Duration(0);
-    return new Duration(minutes: Primitives.getTimeZoneOffsetInMinutes(this));
-  }
-
-  patch int get year() => Primitives.getYear(this);
-
-  patch int get month() => Primitives.getMonth(this);
-
-  patch int get day() => Primitives.getDay(this);
-
-  patch int get hour() => Primitives.getHours(this);
-
-  patch int get minute() => Primitives.getMinutes(this);
-
-  patch int get second() => Primitives.getSeconds(this);
-
-  patch int get millisecond() => Primitives.getMilliseconds(this);
-
-  patch int get weekday() => Primitives.getWeekday(this);
-}