Remove unused ExtensionRegistry

Became unused in change 48337b6aae (commit 7ec5789).

Change-Id: I53a2e8bccaf6588cdddd9bb36a3478452bf66108

client/includes/Hooks/ExtensionLoadHandler.php

@@ -3,7 +3,6 @@
 namespace Wikibase\Client\Hooks;
 
 use ApiMain;
-use ExtensionRegistry;
 use MediaWiki\HookContainer\HookContainer;
 use MediaWiki\MediaWikiServices;
 use Parser;
@@ -24,27 +23,20 @@
  */
 class ExtensionLoadHandler {
 
-	/** @var ExtensionRegistry */
-	private $extensionRegistry;
-
 	/** @var HookContainer */
 	private $hookContainer;
 
 	/**
-	 * @param ExtensionRegistry $extensionRegistry
 	 * @param HookContainer $hookContainer
 	 */
 	public function __construct(
-		ExtensionRegistry $extensionRegistry,
 		HookContainer $hookContainer
 	) {
-		$this->extensionRegistry = $extensionRegistry;
 		$this->hookContainer = $hookContainer;
 	}
 
 	public static function factory(): self {
 		return new self(
-			ExtensionRegistry::getInstance(),
 			MediaWikiServices::getInstance()->getHookContainer()
 		);
 	}

client/tests/phpunit/unit/includes/Hooks/ExtensionLoadHandlerTest.php

@@ -2,7 +2,6 @@
 
 namespace Wikibase\Client\Tests\Unit\Hooks;
 
-use ExtensionRegistry;
 use MediaWiki\HookContainer\HookContainer;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
@@ -37,12 +36,10 @@ function ( $name, $handler ) use ( &$hooks ) {
 	}
 
 	public function testGetHooks() {
-		$extensionRegistry = $this->createMock( ExtensionRegistry::class );
-
 		$actualHooks = [];
 		$container = $this->getFauxHookContainer( $actualHooks );
 
-		$handler = new ExtensionLoadHandler( $extensionRegistry, $container );
+		$handler = new ExtensionLoadHandler( $container );
 		$handler->registerHooks();
 
 		$expectedHooks = [
@@ -54,7 +51,7 @@ public function testGetHooks() {
 	}
 
 	public function testGetApiFormatReferenceSpec_settingTrue() {
-		$handler = new ExtensionLoadHandler( $this->createMock( ExtensionRegistry::class ), $this->createMock( HookContainer::class ) );
+		$handler = new ExtensionLoadHandler( $this->createMock( HookContainer::class ) );
 
 		$spec = $handler->getApiFormatReferenceSpec( [ 'dataBridgeEnabled' => true ] );
 
@@ -64,7 +61,7 @@ public function testGetApiFormatReferenceSpec_settingTrue() {
 
 	/** @dataProvider provideNotTrueDataBridgeEnabledSettings */
 	public function testGetApiFormatReferenceSpec_settingNotTrue( array $settings ) {
-		$handler = new ExtensionLoadHandler( $this->createMock( ExtensionRegistry::class ), $this->createMock( HookContainer::class ) );
+		$handler = new ExtensionLoadHandler( $this->createMock( HookContainer::class ) );
 
 		$spec = $handler->getApiFormatReferenceSpec( $settings );