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diff --git a/WebCore/page/mac/ChromeMac.mm b/WebCore/page/mac/ChromeMac.mm
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+++ b/WebCore/page/mac/ChromeMac.mm
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+// -*- mode: c++; c-basic-offset: 4 -*-
+/*
+ * Copyright (C) 2007 Apple Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#import "config.h"
+#import "Chrome.h"
+
+#import "BlockExceptions.h"
+#import "Frame.h"
+#import "Page.h"
+
+namespace WebCore {
+
+void Chrome::focusNSView(NSView* view)
+{
+    BEGIN_BLOCK_OBJC_EXCEPTIONS;
+
+    WebCoreFrameBridge *bridge = m_page->mainFrame()->bridge();
+    NSResponder *firstResponder = [bridge firstResponder];
+    if (firstResponder == view)
+        return;
+
+    if (![view window] || ![view superview] || ![view acceptsFirstResponder])
+        return;
+
+    [bridge makeFirstResponder:view];
+
+    // Setting focus can actually cause a style change which might
+    // remove the view from its superview while it's being made
+    // first responder. This confuses AppKit so we must restore
+    // the old first responder.
+    if (![view superview])
+        [bridge makeFirstResponder:firstResponder];
+
+    END_BLOCK_OBJC_EXCEPTIONS;
+}
+
+} // namespace WebCore
+