Center permission bubble if location bar is hidden in MacOS.

chrome/browser/ui/cocoa/website_settings/permission_bubble_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/website_settings/permission_bubble_controller.h"
 
 #include <algorithm>
 
 #include "base/mac/bind_objc_block.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 212 matching lines @@
                     styleMask:NSBorderlessWindowMask
                       backing:NSBackingStoreBuffered
                         defer:NO]);
   [window setAllowedAnimations:info_bubble::kAnimateNone];
   [window setReleasedWhenClosed:NO];
   if ((self = [super initWithWindow:window
                        parentWindow:parentWindow
                          anchoredAt:NSZeroPoint])) {
     [self setShouldCloseOnResignKey:NO];
     [self setShouldOpenAsKeyWindow:NO];
-    [[self bubble] setArrowLocation:info_bubble::kTopLeft];
+    [[self bubble] setArrowLocation:bridge->GetArrowLocation()];
     bridge_ = bridge;
     NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
     [center addObserver:self
                selector:@selector(parentWindowDidMove:)
                    name:NSWindowDidMoveNotification
                  object:parentWindow];
   }
   return self;
 }
 
@@ skipping 319 matching lines @@
 
 + (void)alignCenterOf:(NSView*)viewA verticallyToCenterOf:(NSView*)viewB {
   NSRect frameA = [viewA frame];
   NSRect frameB = [viewB frame];
   frameA.origin.y =
       NSMinY(frameB) + std::floor((NSHeight(frameB) - NSHeight(frameA)) / 2);
   [viewA setFrameOrigin:frameA.origin];
 }
 
 @end  // implementation PermissionBubbleController