shouldBecome* outputs variable name instead of its value on failure

LayoutTests/resources/js-test.js

Index: LayoutTests/resources/js-test.js
diff --git a/LayoutTests/resources/js-test.js b/LayoutTests/resources/js-test.js
index 6e578d5e6372b8e7504823684e1c674f6f11e984..fc395457e054c749d38f4e5149732f7fa3144a62 100644
--- a/LayoutTests/resources/js-test.js
+++ b/LayoutTests/resources/js-test.js
@@ -229,6 +229,7 @@ function shouldBecomeEqual(_a, _b, completionHandler, timeout)
   if (timeout === undefined)
     timeout = 500;
 
+  var _bv;
   var condition = function() {
     var exception;
     var _av;
@@ -237,7 +238,7 @@ function shouldBecomeEqual(_a, _b, completionHandler, timeout)
     } catch (e) {
       exception = e;
     }
-    var _bv = eval(_b);
+    _bv = eval(_b);
     if (exception)
       testFailed(_a + " should become " + _bv + ". Threw exception " + exception);
     if (isResultCorrect(_av, _bv)) {
@@ -248,7 +249,7 @@ function shouldBecomeEqual(_a, _b, completionHandler, timeout)
   };
   var failureTime = Date.now() + timeout;
   var failureHandler = function () {
-    testFailed(_a + " failed to change to " + _b + " in " + (timeout / 1000) + " seconds.");
+    testFailed(_a + " failed to change to " + _bv + " in " + (timeout / 1000) + " seconds.");
     completionHandler();
   };
   _waitForCondition(condition, failureTime, completionHandler, failureHandler);
@@ -348,6 +349,7 @@ function shouldBecomeDifferent(_a, _b, completionHandler, timeout)
   if (timeout === undefined)
     timeout = 500;
 
+  var _bv;
   var condition = function() {
     var exception;
     var _av;
@@ -356,7 +358,7 @@ function shouldBecomeDifferent(_a, _b, completionHandler, timeout)
     } catch (e) {
       exception = e;
     }
-    var _bv = eval(_b);
+    _bv = eval(_b);
     if (exception)
       testFailed(_a + " should became not equal to " + _bv + ". Threw exception " + exception);
     if (!isResultCorrect(_av, _bv)) {
@@ -367,7 +369,7 @@ function shouldBecomeDifferent(_a, _b, completionHandler, timeout)
   };
   var failureTime = Date.now() + timeout;
   var failureHandler = function () {
-    testFailed(_a + " did not become different from " + _b + " in " + (timeout / 1000) + " seconds.");
+    testFailed(_a + " did not become different from " + _bv + " in " + (timeout / 1000) + " seconds.");
     completionHandler();
   };
   _waitForCondition(condition, failureTime, completionHandler, failureHandler);