Issue #1957142 follow-up by dawehner, jibran: Fix a few more config() =>...

Issue #1957142 follow-up by dawehner, jibran: Fix a few more config() => Drupal::config() stragglers.

core/includes/common.inc

@@ -3179,7 +3179,7 @@ function drupal_page_set_cache(Response $response, Request $request) {
   if (drupal_page_is_cacheable()) {
 
     // Check if the current page may be compressed.
-    $page_compressed = config('system.performance')->get('response.gzip') && extension_loaded('zlib');
+    $page_compressed = Drupal::config('system.performance')->get('response.gzip') && extension_loaded('zlib');
 
     $cache = (object) array(
       'cid' => drupal_page_cache_get_cid($request),

core/includes/config.inc

@@ -69,15 +69,16 @@ function config_get_storage_names_with_prefix($prefix = '') {
  * Retrieves a configuration object.
  *
  * This is the main entry point to the configuration API. Calling
- * @code config('book.admin') @endcode will return a configuration object in
- * which the book module can store its administrative settings.
+ * @code \Drupal::config('book.admin') @endcode will return a configuration
+ * object in which the book module can store its administrative settings.
  *
  * @deprecated as of Drupal 8.0. Use \Drupal::config() instead.
  *
  * @param string $name
  *   The name of the configuration object to retrieve. The name corresponds to
- *   a configuration file. For @code config('book.admin') @endcode, the config
- *   object returned will contain the contents of book.admin configuration file.
+ *   a configuration file. For @code \Drupal::config('book.admin') @endcode, the
+ *   config object returned will contain the contents of book.admin
+ *   configuration file.
  *
  * @return Drupal\Core\Config\Config
  *   A configuration object.

core/lib/Drupal/Core/Controller/ControllerBase.php

@@ -64,8 +64,9 @@ protected function cache($bin = 'cache') {
    *
    * @param string $name
    *   The name of the configuration object to retrieve. The name corresponds to
-   *   a configuration file. For @code config('book.admin') @endcode, the config
-   *   object returned will contain the contents of book.admin configuration file.
+   *   a configuration file. For @code \Drupal::config('book.admin') @endcode,
+   *   the config object returned will contain the contents of book.admin
+   *   configuration file.
    *
    * @return \Drupal\Core\Config\Config
    *   A configuration object.

core/lib/Drupal/Core/Datetime/Date.php

@@ -142,7 +142,7 @@ protected function dateFormat($format) {
    */
   protected function country() {
     if ($this->country === NULL) {
-      $this->country = config('system.date')->get('country.default');
+      $this->country = \Drupal::config('system.date')->get('country.default');
     }
     return $this->country;
   }

core/modules/system/lib/Drupal/system/Tests/Bootstrap/PageCacheTest.php

@@ -45,7 +45,7 @@ function setUp() {
    * Tests support for different cache items with different Accept headers.
    */
   function testAcceptHeaderRequests() {
-    $config = config('system.performance');
+    $config = \Drupal::config('system.performance');
     $config->set('cache.page.use_internal', 1);
     $config->set('cache.page.max_age', 300);
     $config->save();