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

chrome/browser/chrome_browser_application_mac.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROME_BROWSER_APPLICATION_MAC_H_
 #define CHROME_BROWSER_CHROME_BROWSER_APPLICATION_MAC_H_
 
 #ifdef __OBJC__
 
 #import <AppKit/AppKit.h>
 #include <stddef.h>
 
-#include <vector>
-
 #import "base/mac/scoped_sending_event.h"
 #import "base/message_loop/message_pump_mac.h"
-#include "base/synchronization/lock.h"
 
 @interface BrowserCrApplication : NSApplication<CrAppProtocol,
                                                 CrAppControlProtocol> {
  @private
   BOOL handlingSendEvent_;
   BOOL cyclingWindows_;
-
-  // App's previous key windows. Most recent key window is last.
-  // Does not include current key window. Elements of this vector are weak
-  // references.
-  std::vector<NSWindow*> previousKeyWindows_;
-
-  // Guards previousKeyWindows_.
-  base::Lock previousKeyWindowsLock_;
 }
 
 // Our implementation of |-terminate:| only attempts to terminate the
 // application, i.e., begins a process which may lead to termination. This
 // method cancels that process.
 - (void)cancelTerminate:(id)sender;
 
-// Keep track of the previous key windows and whether windows are being
-// cycled for use in determining whether a Panel window can become the
-// key window.
-- (NSWindow*)previousKeyWindow;
+// Keep track of whether windows are being cycled for use in determining whether
+// a Panel window can become the key window.
 - (BOOL)isCyclingWindows;
 @end
 
 namespace chrome_browser_application_mac {
 
 // Bin for unknown exceptions. Exposed for testing purposes.
 extern const size_t kUnknownNSException;
 
 // Returns the histogram bin for |exception| if it is one we track
 // specifically, or |kUnknownNSException| if unknown.  Exposed for testing
@@ skipping 14 matching lines @@
 
 // Calls -[NSApp terminate:].
 void Terminate();
 
 // Cancels a termination started by |Terminate()|.
 void CancelTerminate();
 
 }  // namespace chrome_browser_application_mac
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_APPLICATION_MAC_H_