Use symbol literals in the mirror tests. (Except for void, the empty string and setters.)

tests/lib/mirrors/fake_function_test.dart

 // Copyright (c) 2013, 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.
 
 import "dart:mirrors";
 
 import "package:expect/expect.dart";
 
 class WannabeFunction {
   int call(int a, int b) => a + b;
   method(x) => x * x;
 }
 
 main() {
   Expect.isTrue(new WannabeFunction() is Function);
 
   ClosureMirror cm = reflect(new WannabeFunction());
-  Expect.equals(7, cm.invoke(const Symbol("call"), [3,4]).reflectee);
-  Expect.throws(() => cm.invoke(const Symbol("call"), [3]),
+  Expect.equals(7, cm.invoke(#call, [3,4]).reflectee);
+  Expect.throws(() => cm.invoke(#call, [3]),
                 (e) => e is NoSuchMethodError,
                 "Wrong arity");
-  Expect.equals(49, cm.invoke(const Symbol("method"), [7]).reflectee);
-  Expect.throws(() => cm.invoke(const Symbol("method"), [3, 4]),
+  Expect.equals(49, cm.invoke(#method, [7]).reflectee);
+  Expect.throws(() => cm.invoke(#method, [3, 4]),
                 (e) => e is NoSuchMethodError,
                 "Wrong arity");
   Expect.equals(7, cm.apply([3,4]).reflectee);
   Expect.throws(() => cm.apply([3]),
                 (e) => e is NoSuchMethodError,
                 "Wrong arity");
 
   MethodMirror mm = cm.function;
-  Expect.equals(const Symbol("call"), mm.simpleName);
-  Expect.equals(reflectClass(WannabeFunction),
-                mm.owner);
+  Expect.equals(#call, mm.simpleName);
+  Expect.equals(reflectClass(WannabeFunction), mm.owner);
   Expect.isTrue(mm.isRegularMethod);
-  Expect.equals(const Symbol("int"), mm.returnType.simpleName);
-  Expect.equals(const Symbol("int"), mm.parameters[0].type.simpleName);
-  Expect.equals(const Symbol("int"), mm.parameters[1].type.simpleName);
+  Expect.equals(#int, mm.returnType.simpleName);
+  Expect.equals(#int, mm.parameters[0].type.simpleName);
+  Expect.equals(#int, mm.parameters[1].type.simpleName);
 
   ClassMirror km = cm.type;
   Expect.equals(reflectClass(WannabeFunction), km);
-  Expect.equals(const Symbol("WannabeFunction"), km.simpleName);
-  Expect.equals(mm, km.members[const Symbol("call")]);
-  Expect.setEquals([const Symbol("call"), const Symbol("method")],
-                   km.members.keys);
+  Expect.equals(#WannabeFunction, km.simpleName);
+  Expect.equals(mm, km.members[#call]);
+  Expect.setEquals([#call, #method], km.members.keys);
 }