Make hashCode a getter and not a method.

tests/co19/co19-compiler.status

 # 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.
 
 [ $compiler == dartc ]
 # We are now actually skipping these because of inter-test dependencies.
 Language/13_Libraries_and_Scripts/2_Imports_A02_t21: Skip # TODO(analyzer-team): Please triage this crash.
 Language/13_Libraries_and_Scripts/3_Includes_A01_t23: Skip # TODO(analyzer-team): Please triage this crash.
 Language/13_Libraries_and_Scripts/2_Imports_A03_t07: Skip # TODO(analyzer-team): Please triage this crash.
 
@@ skipping 255 matching lines @@
 Language/10_Expressions/22_Shift_A01_t12: Fail # language change 3368
 Language/10_Expressions/26_Postfix_Expressions_A01_t01: Fail # Issue 1489,2439
 Language/10_Expressions/27_Assignable_Expressions_A01_t26: Fail # Issue 1489
 Language/10_Expressions/29_Type_Test_A01_t02: Fail # language change 3368
 Language/11_Statements/05_For_A01_t11: Fail # Issue 3323
 Language/11_Statements/08_Switch_A06_t02: Fail, OK # out of date - case can use any constant expression
 Language/11_Statements/08_Switch_A06_t03: Fail, OK # out of date - case can use any constant expression
 Language/11_Statements/08_Switch_A06_t04: Fail, OK # out of date - case can use any constant expression
 
 
+# The following tests use hashCode() (function) instead of hashCode (getter).
+# co19 issue 273
+Language/10_Expressions/11_Instance_Creation/1_New_A12_t01: Fail, OK
+LibTest/isolate/SendPort/hashCode_A01_t01: Pass, OK
+LibTest/core/Map/putIfAbsent_A01_t04: Fail, OK
+LibTest/core/Map/Map_class_A01_t03: Fail, OK
+LibTest/core/Set/remove_A01_t03: Fail, OK
+LibTest/core/Set/contains_A01_t03: Pass, OK
+LibTest/core/Set/addAll_A01_t04: Pass, OK
+LibTest/core/Set/remove_A01_t04: Pass, OK
+LibTest/core/Set/addAll_A01_t03: Fail, OK
+LibTest/core/Set/removeAll_A01_t03: Pass, OK
+LibTest/core/Set/forEach_A01_t03: Fail, OK
+LibTest/core/Set/add_A01_t03: Fail, OK
+LibTest/core/Set/filter_A01_t03: Fail, OK
+LibTest/core/String/hashCode_A01_t01: Pass, OK
+LibTest/core/int/hashCode_A01_t01: Pass, OK
+
 # The following tests use the deprecated catch syntax
 
 LibTest/core/Expect/equals_A02_t01: Fail, OK
 Language/06_Functions/3_Type_of_a_Function_A01_t01: Fail, OK
 Language/10_Expressions/15_Method_Invocation/1_Ordinary_Invocation_A05_t07: Fail, OK
 Language/10_Expressions/15_Method_Invocation/4_Super_Invocation_A03_t02: Fail, OK
 Language/10_Expressions/15_Method_Invocation/3_Static_Invocation_A06_t02: Fail, OK
 Language/10_Expressions/15_Method_Invocation/4_Super_Invocation_A07_t01: Fail, OK
 Language/10_Expressions/15_Method_Invocation/3_Static_Invocation_A05_t01: Fail, OK
 Language/10_Expressions/15_Method_Invocation/4_Super_Invocation_A03_t03: Fail, OK
@@ skipping 51 matching lines @@
 Language/11_Statements/05_For/2_For_in_A01_t02: Fail, OK
 Language/11_Statements/08_Switch_A06_t04: Fail, OK
 Language/03_Overview/2_Privacy_A01_t11: Fail, OK
 Language/03_Overview/1_Scoping_A02_t28: Fail, OK
 Language/03_Overview/2_Privacy_A01_t18: Fail, OK
 Language/03_Overview/2_Privacy_A01_t08: Fail, OK
 
 
 [ $runtime == drt && ($compiler == none || $compiler == frog) ]
 *: Skip