Convert Base to Kotlin

Part of the kotlin conversion process for the tests in the Lifecycle library.

Test: all tests still pass
Bug: 240298180
Change-Id: I810e616128692b1fdd977da7fac97294e7b2edf6

diff --git a/lifecycle/lifecycle-common/src/test/java/androidx/lifecycle/observers/Base.kt b/lifecycle/lifecycle-common/src/test/java/androidx/lifecycle/observers/Base.kt
index fb21268..6118451 100644
--- a/lifecycle/lifecycle-common/src/test/java/androidx/lifecycle/observers/Base.kt
+++ b/lifecycle/lifecycle-common/src/test/java/androidx/lifecycle/observers/Base.kt

@@ -14,15 +14,13 @@
  * limitations under the License.
  */
 
-package androidx.lifecycle.observers;
+package androidx.lifecycle.observers
 
-import androidx.lifecycle.Lifecycle;
-import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleObserver
 
-@SuppressWarnings("deprecation")
-public class Base implements LifecycleObserver {
-
+open class Base : LifecycleObserver {
+    @Suppress("DEPRECATION")
     @androidx.lifecycle.OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
-    public void onCreate() {
-    }
+    open fun onCreate() {}
 }