Revert "Issue #2498515 by neclimdul: Update additional Symfony Components to 2.7.0"

core/composer.lock

core/vendor/composer/autoload_namespaces.php

core/vendor/composer/autoload_psr4.php

core/vendor/composer/installed.json

...mfony/browser-kit/Symfony/Component/BrowserKit/.gitignore

...ony/browser-kit/Symfony/Component/BrowserKit/CHANGELOG.md

...mfony/browser-kit/Symfony/Component/BrowserKit/Client.php

...mfony/browser-kit/Symfony/Component/BrowserKit/Cookie.php

...ny/browser-kit/Symfony/Component/BrowserKit/CookieJar.php

...fony/browser-kit/Symfony/Component/BrowserKit/History.php

.../symfony/browser-kit/Symfony/Component/BrowserKit/LICENSE

...ymfony/browser-kit/Symfony/Component/BrowserKit/README.md

...fony/browser-kit/Symfony/Component/BrowserKit/Request.php

...ony/browser-kit/Symfony/Component/BrowserKit/Response.php

...ser-kit/Symfony/Component/BrowserKit/Tests/ClientTest.php

...-kit/Symfony/Component/BrowserKit/Tests/CookieJarTest.php

...ser-kit/Symfony/Component/BrowserKit/Tests/CookieTest.php

...er-kit/Symfony/Component/BrowserKit/Tests/HistoryTest.php

...er-kit/Symfony/Component/BrowserKit/Tests/RequestTest.php

...r-kit/Symfony/Component/BrowserKit/Tests/ResponseTest.php