Fix broken app title in folder animation

Changes:
Change from ASCIIToUTF16 to UTF8ToUTF16.

Bug: 876953
Change-Id: I6cc3fc093b3ee7dc7d1a94e17c118ad7d0c4a573
Reviewed-on: https://chromium-review.googlesource.com/1186135Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585537}

ash/app_list/views/app_list_folder_view.cc

@@ -243,7 +243,7 @@ class TopIconAnimation : public AppListFolderView::Animation,
                                   : folder_view_->folder_item_icon_bounds();
 
       TopIconAnimationView* icon_view = new TopIconAnimationView(
-          top_item->icon(), base::ASCIIToUTF16(top_item->GetDisplayName()),
+          top_item->icon(), base::UTF8ToUTF16(top_item->GetDisplayName()),
           scaled_rect, show_, item_in_folder_icon);
 
       icon_view->AddObserver(this);