minor silexphp#130 Simplify extend calls (hkdobrev)

This PR was merged into the 2.0.x-dev branch.

Discussion
----------

Simplify extend calls

Since Pimple 2.x there is no need to re-assign the result from the extend() call to the same key. Pimple already does that.

Commits
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19989b3 Simplify extend calls

WebProfilerServiceProvider.php

@@ -136,7 +136,7 @@ public function register(Container $app)
         }
 
         if (class_exists('Symfony\Bridge\Twig\Extension\ProfilerExtension')) {
-            $app['data_collectors'] = $app->extend('data_collectors', function ($collectors, $app) {
+            $app->extend('data_collectors', function ($collectors, $app) {
                 $collectors['twig'] = function ($app) {
                     return new TwigDataCollector($app['twig.profiler.profile'], $app['twig']);
                 };
@@ -154,7 +154,7 @@ public function register(Container $app)
                 return new DumpListener($app['var_dumper.cloner'], $app['var_dumper.data_collector']);
             };
 
-            $app['data_collectors'] = $app->extend('data_collectors', function ($collectors, $app) {
+            $app->extend('data_collectors', function ($collectors, $app) {
                 if ($app['profiler.templates_path.debug']) {
                     $collectors['dump'] = function ($app) {
                         $dumper = null === $app['var_dumper.dump_destination'] ? null : $app['var_dumper.cli_dumper'];
@@ -168,7 +168,7 @@ public function register(Container $app)
         }
 
         if (class_exists('Symfony\Component\HttpKernel\DataCollector\AjaxDataCollector')) {
-            $app['data_collectors'] = $app->extend('data_collectors', function ($collectors, $app) {
+            $app->extend('data_collectors', function ($collectors, $app) {
                 $collectors['ajax'] = function ($app) {
                     return new AjaxDataCollector();
                 };
@@ -223,7 +223,7 @@ public function register(Container $app)
         }
 
         if (isset($app['translator']) && class_exists('Symfony\Component\Translation\DataCollector\TranslationDataCollector')) {
-            $app['data_collectors'] = $app->extend('data_collectors', function ($collectors, $app) {
+            $app->extend('data_collectors', function ($collectors, $app) {
                 $collectors['translation'] = function ($app) {
                     return new TranslationDataCollector($app['translator']);
                 };