Set overflow bubble with the correct radius

The wrong radius was set by the culprit CL (crrev.com/c/1806015).
This CL fixes such an issue.

Bug: 1011013
Change-Id: I10659f593914fa3bdea0ca8b0f6f8bbb141c000f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865480
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706581}

ash/shelf/overflow_bubble_view.cc

@@ -236,7 +236,7 @@ OverflowBubbleView::OverflowBubbleView(ShelfView* shelf_view,
   DCHECK(shelf_view_);
   DCHECK(GetShelf());
 
-  const int shelf_size = ShelfConfig::Get()->shelf_size() / 2;
+  const int shelf_size = ShelfConfig::Get()->shelf_size();
   set_border_radius(views::LayoutProvider::Get()->GetCornerRadiusMetric(
       views::EMPHASIS_MAXIMUM, {shelf_size, shelf_size}));
   SetArrow(views::BubbleBorder::NONE);