Mac: Remove a case where panels may become key when an autofill popup closes

chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.mm

 // Copyright (c) 2012 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/cocoa/panels/panel_window_controller_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 77 matching lines @@
   BrowserCrApplication* app = base::mac::ObjCCast<BrowserCrApplication>(
       [BrowserCrApplication sharedApplication]);
 
   // A Panel window can become the key window only in limited scenarios.
   // This prevents the system from always preferring a Panel window due
   // to its higher priority NSWindowLevel when selecting a window to make key.
   return ([app isHandlingSendEvent]  && [[app currentEvent] window] == self) ||
       [controller activationRequestedByPanel] ||
       [app isCyclingWindows] ||
       [self isKeyWindow] ||
-      [app previousKeyWindow] == self ||
       [[app windows] count] == static_cast<NSUInteger>([controller numPanels]);
 }
 
 - (void)performMiniaturize:(id)sender {
   [[self windowController] minimizeButtonClicked:0];
 }
 
 - (void)mouseMoved:(NSEvent*)event {
   // Cocoa does not support letting the application determine the edges that
   // can trigger the user resizing. To work around this, we track the mouse
@@ skipping 848 matching lines @@
       if (![window canBecomeKeyWindow])
         continue;
 
       [window makeKeyWindow];
     }
     return;
   }
 }
 
 @end