Hide ClosureMirror.findInContext behind a flag for 1.0.

tests/lib/mirrors/find_in_context_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.
 
+// VMOptions=--support_find_in_context=true
+
 import "dart:mirrors";
 
 import "stringify.dart";
 
 import "package:expect/expect.dart";
 
 import "closure_mirror_import1.dart";
 import "closure_mirror_import1.dart" as imp1;
 import "closure_mirror_import1.dart" as imp1_hidden
     hide globalVariableInImport, StaticClass;
@@ skipping 47 matching lines @@
   expect("Instance(value = 17)", result.apply(const []));
 
   result = cm.findInContext(#S.staticInS);
   expect("Instance(value = staticInS)", result);
 
   result = cm.findInContext(#staticInS);
   Expect.isFalse(result is InstanceMirror);
   Expect.equals(null, result);
 
   result = cm.findInContext(#staticFooInS);
+  Expect.isFalse(result is InstanceMirror);
+  Expect.equals(null, result);
+
+  result = cm.findInContext(#S.staticFooInS);
   Expect.isTrue(result is ClosureMirror);
   expect("Instance(value = staticFooInS)", result.apply(const []));
 
   result = cm.findInContext(#C.staticFooInS);
-  Expect.isTrue(result is ClosureMirror);
-  expect("Instance(value = staticFooInS)", result.apply(const []));
+  Expect.isFalse(result is InstanceMirror);
+  Expect.equals(null, result);
 
   result = cm.findInContext(#C.staticInC);
   expect("Instance(value = staticInC)", result);
 
   result = cm.findInContext(#staticInC);
   expect("Instance(value = staticInC)", result);
 
   result = cm.findInContext(#C.staticFooInC);
   Expect.isTrue(result is ClosureMirror);
   expect("Instance(value = staticFooInC)", result.apply(const []));
@@ skipping 54 matching lines @@
   result = c.bar().findInContext(#instanceInC);
   expect("Instance(value = 11)", result);
 
   result = c.bar().findInContext(#y);
   Expect.isFalse(result is InstanceMirror);
   Expect.equals(null, result);
 
   result = c.baz().findInContext(#instanceInC);
   expect("Instance(value = <null>)", result);
 }