Deprecated the web_profiler.position option

src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md

@@ -53,6 +53,8 @@ CHANGELOG
    `EventDispatcherDebugCommand`, `RouterDebugCommand`, `RouterMatchCommand`,
    `TranslationDebugCommand`, `TranslationUpdateCommand`, `XliffLintCommand`
     and `YamlLintCommand` classes have been marked as final
+ * Deprecated the `web_profiler.position` config option (in Symfony 4.0 the toolbar
+   will always be displayed at the bottom).
 
 3.3.0
 -----

src/Symfony/Bundle/WebProfilerBundle/DependencyInjection/Configuration.php

@@ -39,6 +39,7 @@ class Configuration implements ConfigurationInterface
                 ->booleanNode('toolbar')->defaultFalse()->end()
                 ->scalarNode('position')
                     ->defaultValue('bottom')
+                    ->setDeprecated('The "web_profiler.position" configuration key has been deprecated in Symfony 3.4 and it will be removed in 4.0.')
                     ->validate()
                         ->ifNotInArray(array('bottom', 'top'))
                         ->thenInvalid('The CSS position %s is not supported')