feature #13840 [WebProfilerBundle] Update ajax calls in toolbar to add the css error class (rubenrua)

This PR was merged into the 2.7 branch.

Discussion
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[WebProfilerBundle] Update ajax calls in toolbar to add the css error class

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Minor change to improve the toolbar usability. The request method is red when an error response is received:

![toolbar ajax error](https://cloud.githubusercontent.com/assets/195745/6475331/2b390a26-c209-11e4-8dee-ef2e973b57c0.png)

Commits
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1ea0f86 [WebProfilerBundle] Update ajax calls in toolbar to add the css error class

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/base_js.html.twig

@@ -90,6 +90,9 @@
                             rows.appendChild(row);
 
                             var methodCell = document.createElement('td');
+                            if (request.error) {
+                                methodCell.className = 'sf-ajax-request-error';
+                            }
                             methodCell.textContent = request.method;
                             row.appendChild(methodCell);
 

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/toolbar.css.twig

@@ -315,7 +315,7 @@
     text-align: right;
 }
 .sf-ajax-request-error {
-    color: #a33;
+    color: #a33 !important;
 }
 .sf-ajax-request-loading {
     -webkit-animation: sf-blink .5s ease-in-out infinite;