Revert of [wasm] Also test structured stack trace

test/mjsunit/mjsunit.js

Index: test/mjsunit/mjsunit.js
diff --git a/test/mjsunit/mjsunit.js b/test/mjsunit/mjsunit.js
index 6a7c2da9e47d1ca56b52c98b3afbd2a2b6d72b6c..9b07953c8aa22a24cd1386e1f212027dab0c7e2f 100644
--- a/test/mjsunit/mjsunit.js
+++ b/test/mjsunit/mjsunit.js
@@ -113,9 +113,6 @@
 // Only works with --allow-natives-syntax.
 var assertOptimized;
 var assertUnoptimized;
-
-// Assert that a string contains another expected substring.
-var assertContains;
 
 
 (function () {  // Scope for utility functions.
@@ -419,12 +416,6 @@
     throw new MjsUnitAssertionError(message);
   };
 
-  assertContains = function(sub, value, name_opt) {
-    if (value == null ? (sub != null) : value.indexOf(sub) == -1) {
-      fail("contains '" + String(sub) + "'", value, name_opt);
-    }
-  };
-
   var OptimizationStatusImpl = undefined;
 
   var OptimizationStatus = function(fun, sync_opt) {