Cleanup: Remove unnecessary ".get()" from scoped_ptrs<>.

ash/shelf/shelf_layout_manager.cc

Index: ash/shelf/shelf_layout_manager.cc
diff --git a/ash/shelf/shelf_layout_manager.cc b/ash/shelf/shelf_layout_manager.cc
index 6e9e3c74e90ecb07295a7a9e350ced207c825f16..b68cab4ac6bd99790b49417f5bb7f301db10459c 100644
--- a/ash/shelf/shelf_layout_manager.cc
+++ b/ash/shelf/shelf_layout_manager.cc
@@ -538,7 +538,7 @@ void ShelfLayoutManager::SetState(ShelfVisibilityState visibility_state) {
   if (state.visibility_state == SHELF_AUTO_HIDE) {
     // When state is SHELF_AUTO_HIDE we need to track when the mouse is over the
     // launcher to unhide the shelf. AutoHideEventFilter does that for us.
-    if (!event_filter_.get())
+    if (!event_filter_)
       event_filter_.reset(new AutoHideEventFilter(this));
   } else {
     event_filter_.reset(NULL);