remove redundant lines

Author: KazuCocoa

lib/commands/content-size.js

@@ -57,8 +57,7 @@ export default {
    * @this {XCUITestDriver}
    */
   async mobileGetContentSize() {
-    const simulator = assertSimulator(this);
-    return /** @type {ContentSize} */ (await simulator.getContentSize());
+    return /** @type {ContentSize} */ (await (assertSimulator(this)).getContentSize());
   },
 };
 

lib/commands/increase-contrast.js

@@ -39,8 +39,7 @@ export default {
    * @this {XCUITestDriver}
    */
   async mobileGetIncreaseContrast() {
-    const simulator = assertSimulator(this);
-    return /** @type {IncreaseContrast} */ (await simulator.getIncreaseContrast());
+    return /** @type {IncreaseContrast} */ (await (assertSimulator(this)).getIncreaseContrast());
   },
 };