Permission prompts show in the top-left corner in fullscreen mode.

chrome/browser/ui/views/website_settings/permissions_bubble_view.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/website_settings/permissions_bubble_view.h"
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 344 matching lines @@
   // Update the border in the bubble: will either add or remove the arrow.
   views::BubbleFrameView* frame =
       views::BubbleDialogDelegateView::GetBubbleFrameView();
   views::BubbleBorder::Arrow adjusted_arrow = anchor_arrow;
   if (base::i18n::IsRTL())
     adjusted_arrow = views::BubbleBorder::horizontal_mirror(adjusted_arrow);
   frame->SetBubbleBorder(std::unique_ptr<views::BubbleBorder>(
       new views::BubbleBorder(adjusted_arrow, shadow(), color())));
 
   // Reposition the bubble based on the updated arrow and view.
-  if (anchor_view)
-    SetAnchorView(anchor_view);
-  else
-    SetAnchorRect(gfx::Rect(anchor_point, gfx::Size()));
+  SetAnchorView(anchor_view);

[Matt Giuca, 2016/07/05 05:44:20]

This change was necessary to properly respond to the |anchor_view| becoming null
(which now calls SetAnchorView(nullptr)). Previously, if |anchor_view| became
null it would remain set to its old value which means it will be stuck anchored
to something.

[benwells, 2016/07/06 01:08:53]

Acknowledged.

+  // The anchor rect is ignored unless |anchor_view| is nullptr.
+  SetAnchorRect(gfx::Rect(anchor_point, gfx::Size()));
 }
 
 //////////////////////////////////////////////////////////////////////////////
 // PermissionBubbleViewViews
 
 PermissionBubbleViewViews::PermissionBubbleViewViews(Browser* browser)
     : browser_(browser),
       delegate_(nullptr),
       bubble_delegate_(nullptr) {
   DCHECK(browser);
@@ skipping 73 matching lines @@
 
 void PermissionBubbleViewViews::Accept() {
   if (delegate_)
     delegate_->Accept();
 }
 
 void PermissionBubbleViewViews::Deny() {
   if (delegate_)
     delegate_->Deny();
 }