Update mirror tests for removed API.

tests/lib/mirrors/private_symbol_test.dart

Index: tests/lib/mirrors/private_symbol_test.dart
diff --git a/tests/lib/mirrors/private_symbol_test.dart b/tests/lib/mirrors/private_symbol_test.dart
index 6b10d802af8adaefaea73fde9deeb91f5628d168..09d8261242ade37b453df661ef320a8cbef861d1 100644
--- a/tests/lib/mirrors/private_symbol_test.dart
+++ b/tests/lib/mirrors/private_symbol_test.dart
@@ -64,37 +64,37 @@ main() {
   Expect.equals(#_C, cm.simpleName);
   Expect.equals('_C', MirrorSystem.getName(cm.simpleName));
 
-  MethodMirror mm = cm.members[#g];
+  MethodMirror mm = cm.declarations[#g];
   Expect.isNotNull(mm);
   Expect.isTrue(mm.isGetter);
   Expect.equals(#g, mm.simpleName);
   Expect.equals('g', MirrorSystem.getName(mm.simpleName));
 
-  mm = cm.members[const Symbol('s=')];
+  mm = cm.declarations[const Symbol('s=')];
   Expect.isNotNull(mm);
   Expect.isTrue(mm.isSetter);
   Expect.equals(const Symbol('s='), mm.simpleName);
   Expect.equals('s=', MirrorSystem.getName(mm.simpleName));
 
-  mm = cm.members[#m];
+  mm = cm.declarations[#m];
   Expect.isNotNull(mm);
   Expect.isTrue(mm.isRegularMethod);
   Expect.equals(#m, mm.simpleName);
   Expect.equals('m', MirrorSystem.getName(mm.simpleName));
 
-  mm = cm.members[#_g];
+  mm = cm.declarations[#_g];
   Expect.isNotNull(mm);
   Expect.isTrue(mm.isGetter);
   Expect.equals(#_g, mm.simpleName);
   Expect.equals('_g', MirrorSystem.getName(mm.simpleName));
 
-  mm = cm.members[MirrorSystem.getSymbol('_s=', libtest)];
+  mm = cm.declarations[MirrorSystem.getSymbol('_s=', libtest)];
   Expect.isNotNull(mm);
   Expect.isTrue(mm.isSetter);
   Expect.equals(MirrorSystem.getSymbol('_s=', libtest), mm.simpleName);
   Expect.equals('_s=', MirrorSystem.getName(mm.simpleName));
 
-  mm = cm.members[#_m];
+  mm = cm.declarations[#_m];
   Expect.isNotNull(mm);
   Expect.isTrue(mm.isRegularMethod);
   Expect.equals(#_m, mm.simpleName);
@@ -109,7 +109,7 @@ main() {
   Expect.equals(#_F, tdm.simpleName);
   Expect.equals('_F', MirrorSystem.getName(tdm.simpleName));
 
-  ParameterMirror pm = (cm.members[#m] as MethodMirror).parameters[0];
+  ParameterMirror pm = (cm.declarations[#m] as MethodMirror).parameters[0];
   Expect.equals(#_p, pm.simpleName);
   Expect.equals('_p', MirrorSystem.getName(pm.simpleName));