Enable mash shelf tooltips.

ash/test/shelf_test_api.cc

Index: ash/test/shelf_test_api.cc
diff --git a/ash/test/shelf_test_api.cc b/ash/test/shelf_test_api.cc
index d050f73769c5b428d0a4012b3f3ff123f1c8fa10..83bc841fd0eaf30b0fb8e60ab22594844876369f 100644
--- a/ash/test/shelf_test_api.cc
+++ b/ash/test/shelf_test_api.cc
@@ -9,12 +9,9 @@
 namespace ash {
 namespace test {
 
-ShelfTestAPI::ShelfTestAPI(Shelf* shelf)
-    : shelf_(shelf) {
-}
+ShelfTestAPI::ShelfTestAPI(Shelf* shelf) : shelf_(shelf) {}
 
-ShelfTestAPI::~ShelfTestAPI() {
-}
+ShelfTestAPI::~ShelfTestAPI() {}
 
 ShelfView* ShelfTestAPI::shelf_view() { return shelf_->shelf_view_; }