[debugger] fix blacklisted tests.

test/mjsunit/regress/regress-crbug-107996.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 12 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (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
 
 Debug = debug.Debug;
 
 Debug.setListener(listener);
-
+var exception = null;
 var fourteen;
 var four_in_debugger = [];
 
 function listener(event, exec_state, event_data, data) {
   if (event == Debug.DebugEvent.Break) {
-    for (var i = 0; i < exec_state.frameCount(); i++) {
-      var frame = exec_state.frame(i);
-      four_in_debugger[i] = frame.evaluate("four", false).value();
+    try {
+      for (var i = 0; i < exec_state.frameCount() - 1; i++) {
+        var frame = exec_state.frame(i);
+        four_in_debugger[i] = frame.evaluate("four", false).value();
+      }
+    } catch (e) {
+      exception = e;
     }
   }
 }
 
 function f1() {
   var three = 3;
   var four = 4;
   (function f2() {
      var seven = 7;
      (function f3() {
         debugger;
         fourteen = three + four + seven;
      })();
   })();
 }
 
 f1();
 assertEquals(14, fourteen);
 assertEquals(4, four_in_debugger[0]);
 assertEquals(4, four_in_debugger[1]);
 assertEquals(4, four_in_debugger[2]);
 
 Debug.setListener(null);
+assertNull(exception);