Check for null |tabstrip_| in BrowserView::IsTabStripVisible()

chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc

Index: chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc
diff --git a/chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc b/chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc
index 7904459102dd2beec0efd228970f59c3c0736c85..208b5c3e5b3f78436a2d50ec293a1b9345bad9aa 100644
--- a/chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc
+++ b/chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc
@@ -400,14 +400,15 @@ bool BrowserNonClientFrameViewAsh::DoesIntersectRect(
     return false;
   }
 
-  TabStrip* tabstrip = browser_view()->tabstrip();
-  if (!tabstrip || !browser_view()->IsTabStripVisible()) {
+  if (!browser_view()->IsTabStripVisible()) {
     // Claim |rect| if it is above the top of the topmost client area view.
     return rect.y() < GetTopInset(false);
   }
 
-  // Claim |rect| if it is above the bottom of the tabstrip in a non-tab
-  // portion.
+  // Claim |rect| only if it is above the bottom of the tabstrip in a non-tab
+  // portion. In particular, the avatar label/button is left of the tabstrip and
+  // the window controls are right of the tabstrip.
+  TabStrip* tabstrip = browser_view()->tabstrip();
   gfx::RectF rect_in_tabstrip_coords_f(rect);
   View::ConvertRectToTarget(this, tabstrip, &rect_in_tabstrip_coords_f);
   const gfx::Rect rect_in_tabstrip_coords(