Do not materialize context-allocated values for debug-evaluate.

test/mjsunit/regress/regress-crbug-259300.js

Index: test/mjsunit/regress/regress-crbug-259300.js
diff --git a/test/mjsunit/regress/regress-frame-details-null-receiver.js b/test/mjsunit/regress/regress-crbug-259300.js
similarity index 85%
copy from test/mjsunit/regress/regress-frame-details-null-receiver.js
copy to test/mjsunit/regress/regress-crbug-259300.js
index d15ed4d00ae774ad01406855fc42cb8c1dfbcc07..c57b0e6f917028f790609482c7d54269b0da615f 100644
--- a/test/mjsunit/regress/regress-frame-details-null-receiver.js
+++ b/test/mjsunit/regress/regress-crbug-259300.js
@@ -25,28 +25,25 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --expose-debug-as debug --allow-natives-syntax
+// Flags: --expose-debug-as debug
 
 Debug = debug.Debug;
 var listened = false;
+var recursion_depth = 0;
 
 function listener(event, exec_state, event_data, data) {
-  if (event == Debug.DebugEvent.Exception) {
+  if (event == Debug.DebugEvent.Break) {
+    recursion_depth++;
+    var disable_break = (recursion_depth > 2);
     for (var i = 0; i < exec_state.frameCount(); i++) {
-      print(exec_state.frame(i).receiver());
-      print(exec_state.frame(i).func().name());
+      exec_state.frame(i).evaluate("debugger", disable_break);
     }
   }
   listened = true;
 }
 
 Debug.setListener(listener);
-Debug.setBreakOnException();
-
-assertThrows(function() { delete null['foo']; });
-
-Debug.clearBreakOnException();
+eval("debugger");
 Debug.setListener(null);
-
 assertTrue(listened);