minor #6748 Fix web/front.php (ranqiangjun)

This PR was merged into the master branch.

Discussion
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Fix web/front.php

## $controller always return false.

    $controller = $controllerResolver->getController($request);
    $arguments = $argumentResolver->getArguments($request, $controller);

The two lines before the `try ... catch` should run after:

    $request->attributes->add($matcher->match($request->getPathInfo()));

The three lines already exist inside the `try ... catch` which works fine and properly after removed those two lines.

([http://symfony.com/doc/master/create_framework/http_kernel_controller_resolver.html](http://symfony.com/doc/master/create_framework/http_kernel_controller_resolver.html))

Commits
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86bb5ac Fix web/front.php

create_framework/http_kernel_controller_resolver.rst

@@ -185,9 +185,6 @@ Let's conclude with the new version of our framework::
     $controllerResolver = new HttpKernel\Controller\ControllerResolver();
     $argumentResolver = new HttpKernel\Controller\ArgumentResolver();
 
-    $controller = $controllerResolver->getController($request);
-    $arguments = $argumentResolver->getArguments($request, $controller);
-
     try {
         $request->attributes->add($matcher->match($request->getPathInfo()));