Fix RequiresApi annotation

#minor-release

PiperOrigin-RevId: 357273184

library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSessionManagerProvider.java

@@ -31,7 +31,6 @@ import java.util.Map;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 
 /** Default implementation of {@link DrmSessionManagerProvider}. */
 /** Default implementation of {@link DrmSessionManagerProvider}. */
-@RequiresApi(18)
 public final class DefaultDrmSessionManagerProvider implements DrmSessionManagerProvider {
 public final class DefaultDrmSessionManagerProvider implements DrmSessionManagerProvider {
 
 
   private final Object lock;
   private final Object lock;
@@ -92,6 +91,7 @@ public final class DefaultDrmSessionManagerProvider implements DrmSessionManager
     }
     }
   }
   }
 
 
+  @RequiresApi(18)
   private DrmSessionManager createManager(MediaItem.DrmConfiguration drmConfiguration) {
   private DrmSessionManager createManager(MediaItem.DrmConfiguration drmConfiguration) {
     HttpDataSource.Factory dataSourceFactory =
     HttpDataSource.Factory dataSourceFactory =
         drmHttpDataSourceFactory != null
         drmHttpDataSourceFactory != null