minor #19216 fixed HttpKernel dependencies after #18688 (HeahDude)

This PR was merged into the 2.7 branch.

Discussion
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fixed HttpKernel dependencies after #18688

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

Commits
-------

f809f3e fixed HttpKernel dependencies after #18688

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -23,7 +23,7 @@
         "symfony/event-dispatcher": "~2.5",
         "symfony/finder": "~2.0,>=2.0.5",
         "symfony/http-foundation": "~2.4.9|~2.5,>=2.5.4",
-        "symfony/http-kernel": "~2.7",
+        "symfony/http-kernel": "~2.7,>=2.7.15",
         "symfony/filesystem": "~2.3",
         "symfony/routing": "~2.6,>2.6.4",
         "symfony/security-core": "~2.6.13|~2.7.9|~2.8",

src/Symfony/Component/HttpKernel/Tests/EventListener/ValidateRequestListenerTest.php

@@ -13,7 +13,6 @@
 
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\EventListener\ValidateRequestListener;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\HttpKernelInterface;

src/Symfony/Component/HttpKernel/composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=5.3.9",
         "symfony/event-dispatcher": "~2.6,>=2.6.7",
-        "symfony/http-foundation": "~2.5,>=2.5.4",
+        "symfony/http-foundation": "~2.7,>=2.7.15",
         "symfony/debug": "~2.6,>=2.6.2",
         "psr/log": "~1.0"
     },