feature#8957 [HttpFoundation] added a way to override the Request class (fabpot)

This PR was merged into the master branch.

Discussion
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[HttpFoundation] added a way to override the Request class

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7461, #7453
| License       | MIT
| Doc PR        | symfony/symfony-docs#3021

This is an alternative implementation for #7461.

I've also reverted #7381 and #7390 as these changes are not needed anymore.

Todo:

 - [ ] add some tests

Commits
-------

464439d [HttpFoundation] added a way to override the Request class

Author: fabpot

Fragment/InlineFragmentRenderer.php

@@ -132,7 +132,7 @@ protected function createSubRequest($uri, Request $request)
 
         $server['REMOTE_ADDR'] = '127.0.0.1';
 
-        $subRequest = $request::create($uri, 'get', array(), $cookies, array(), $server);
+        $subRequest = Request::create($uri, 'get', array(), $cookies, array(), $server);
         if ($request->headers->has('Surrogate-Capability')) {
             $subRequest->headers->set('Surrogate-Capability', $request->headers->get('Surrogate-Capability'));
         }

HttpCache/HttpCache.php

@@ -268,7 +268,7 @@ protected function invalidate(Request $request, $catch = false)
                 // As per the RFC, invalidate Location and Content-Location URLs if present
                 foreach (array('Location', 'Content-Location') as $header) {
                     if ($uri = $response->headers->get($header)) {
-                        $subRequest = $request::create($uri, 'get', array(), array(), array(), $request->server->all());
+                        $subRequest = Request::create($uri, 'get', array(), array(), array(), $request->server->all());
 
                         $this->store->invalidate($subRequest);
                     }