Reverting 26219.

chrome/browser/cocoa/focus_tracker.h

+// Copyright (c) 2009 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 <Cocoa/Cocoa.h>
+
+#include "base/scoped_nsobject.h"
+
+// A class that handles saving and restoring focus.  An instance of
+// this class snapshots the currently focused view when it is
+// constructed, and callers can use restoreFocus to return focus to
+// that view.  FocusTracker will not restore focus to views that are
+// no longer in the view hierarchy or are not in the correct window.
+
+@interface FocusTracker : NSObject {
+ @private
+  scoped_nsobject<NSView> focusedView_;
+}
+
+// |window| is the window that we are saving focus for.  This
+// method snapshots the currently focused view.
+- (id)initWithWindow:(NSWindow*)window;
+
+// Attempts to restore focus to the snapshotted view.  Returns YES if
+// focus was restored.  Will not restore focus if the view is no
+// longer in the view hierarchy under |window|.
+- (BOOL)restoreFocusInWindow:(NSWindow*)window;
+@end