remove private from _focusTrap

Author: mmalerba

src/lib/sidenav/sidenav.ts

@@ -57,7 +57,7 @@ export class MdDuplicatedSidenavError extends MdError {
   encapsulation: ViewEncapsulation.None,
 })
 export class MdSidenav implements AfterContentInit {
-  @ViewChild(FocusTrap) private _focusTrap: FocusTrap;
+  @ViewChild(FocusTrap) _focusTrap: FocusTrap;
 
   /** Alignment of the sidenav (direction neutral); whether 'start' or 'end'. */
   private _align: 'start' | 'end' = 'start';