Remove more dead code after Object.observe removal

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index a6d1de705aca385323251e0d3fd46f70fda25dde..6035f52fb5613487f69450029893e474bf619598 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -16141,11 +16141,12 @@ static void ObjectWithExternalArrayTestHelper(Local<Context> context,
                       "ext_array[3];");
   CHECK_EQ(33, result->Int32Value(context).FromJust());
 
-  result = CompileRun("ext_array[0] = 10; ext_array[1] = 11;"
-                      "ext_array[2] = 12; ext_array[3] = 13;"
-                      "ext_array.__defineGetter__('2',"
-                      "function() { return 120; });"
-                      "ext_array[2];");
+  result = CompileRun(
+      "ext_array[0] = 10; ext_array[1] = 11;"
+      "ext_array[2] = 12; ext_array[3] = 13;"
+      "try { ext_array.__defineGetter__('2',"
+      "function() { return 120; }); } catch(e) {};"
+      "ext_array[2];");
   CHECK_EQ(12, result->Int32Value(context).FromJust());
 
   result = CompileRun("var js_array = new Array(40);"