Re-enable some aura_shell_unittests for asan failure has been resolved in app list.

ash/wm/shelf_layout_manager_unittest.cc

Index: ash/wm/shelf_layout_manager_unittest.cc
diff --git a/ash/wm/shelf_layout_manager_unittest.cc b/ash/wm/shelf_layout_manager_unittest.cc
index d90d05f2e0b7c72f3860059885cb4c825534b92b..48e638d5eaee1bebda1c63c0b878d010c3383467 100644
--- a/ash/wm/shelf_layout_manager_unittest.cc
+++ b/ash/wm/shelf_layout_manager_unittest.cc
@@ -401,8 +401,7 @@ TEST_F(ShelfLayoutManagerTest, VisibleWhenStatusOrLauncherFocused) {
 
 // Makes sure shelf will be visible when app list opens as shelf is in VISIBLE
 // state,and toggling app list won't change shelf visibility state.
-// Disabled due to a real bug, see http://crbug.com/127538.
-TEST_F(ShelfLayoutManagerTest, DISABLED_OpenAppListWithShelfVisibleState) {
+TEST_F(ShelfLayoutManagerTest, OpenAppListWithShelfVisibleState) {
   Shell* shell = Shell::GetInstance();
   ShelfLayoutManager* shelf = Shell::GetInstance()->shelf();
   shelf->LayoutShelf();
@@ -429,8 +428,7 @@ TEST_F(ShelfLayoutManagerTest, DISABLED_OpenAppListWithShelfVisibleState) {
 // Makes sure shelf will be shown with AUTO_HIDE_SHOWN state when app list opens
 // as shelf is in AUTO_HIDE state, and toggling app list won't change shelf
 // visibility state.
-// Disabled due to a real bug, see http://crbug.com/127538.
-TEST_F(ShelfLayoutManagerTest, DISABLED_OpenAppListWithShelfAutoHideState) {
+TEST_F(ShelfLayoutManagerTest, OpenAppListWithShelfAutoHideState) {
   Shell* shell = Shell::GetInstance();
   ShelfLayoutManager* shelf = Shell::GetInstance()->shelf();
   shelf->LayoutShelf();
@@ -463,8 +461,7 @@ TEST_F(ShelfLayoutManagerTest, DISABLED_OpenAppListWithShelfAutoHideState) {
 
 // Makes sure shelf will be hidden when app list opens as shelf is in HIDDEN
 // state, and toggling app list won't change shelf visibility state.
-// Disabled due to a real bug, see http://crbug.com/127538.
-TEST_F(ShelfLayoutManagerTest, DISABLED_OpenAppListWithShelfHiddenState) {
+TEST_F(ShelfLayoutManagerTest, OpenAppListWithShelfHiddenState) {
   Shell* shell = Shell::GetInstance();
   ShelfLayoutManager* shelf = Shell::GetInstance()->shelf();
   // For shelf to be visible, app list is not open in initial state.