[FrameworkBundle] Remove asset from require-dev

Author: dunglas

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -34,7 +34,6 @@
     },
     "require-dev": {
         "symfony/phpunit-bridge": "~2.7|~3.0.0",
-        "symfony/asset": "~2.7|~3.0.0",
         "symfony/browser-kit": "~2.4|~3.0.0",
         "symfony/console": "~2.6|~3.0.0",
         "symfony/css-selector": "~2.0,>=2.0.5|~3.0.0",