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diff --git a/Source/WebKit2/UIProcess/mac/WebPreferencesMac.mm b/Source/WebKit2/UIProcess/mac/WebPreferencesMac.mm
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+++ b/Source/WebKit2/UIProcess/mac/WebPreferencesMac.mm
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+/*
+ * Copyright (C) 2010, 2011 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "WebPreferences.h"
+
+#include "PageClientImpl.h"
+#include <wtf/text/StringConcatenate.h>
+
+namespace WebKit {
+
+static inline NSString* makeKey(const String& identifier, const String& baseKey)
+{
+    return nsStringFromWebCoreString(makeString(identifier, ".WebKit2", baseKey));
+}
+
+static void setStringValueIfInUserDefaults(const String& identifier, const String& key, WebPreferencesStore& store)
+{
+    id object = [[NSUserDefaults standardUserDefaults] objectForKey:makeKey(identifier, key)];
+    if (!object)
+        return;
+    if (![object isKindOfClass:[NSString class]])
+        return;
+
+    store.setStringValueForKey(key, (NSString *)object);
+}
+
+static void setBoolValueIfInUserDefaults(const String& identifier, const String& key, WebPreferencesStore& store)
+{
+    id object = [[NSUserDefaults standardUserDefaults] objectForKey:makeKey(identifier, key)];
+    if (!object)
+        return;
+    if (![object respondsToSelector:@selector(boolValue)])
+        return;
+
+    store.setBoolValueForKey(key, [object boolValue]);
+}
+
+static void setUInt32ValueIfInUserDefaults(const String& identifier, const String& key, WebPreferencesStore& store)
+{
+    id object = [[NSUserDefaults standardUserDefaults] objectForKey:makeKey(identifier, key)];
+    if (!object)
+        return;
+    if (![object respondsToSelector:@selector(intValue)])
+        return;
+
+    store.setUInt32ValueForKey(key, [object intValue]);
+}
+
+static void setDoubleValueIfInUserDefaults(const String& identifier, const String& key, WebPreferencesStore& store)
+{
+    id object = [[NSUserDefaults standardUserDefaults] objectForKey:makeKey(identifier, key)];
+    if (!object)
+        return;
+    if (![object respondsToSelector:@selector(doubleValue)])
+        return;
+
+    store.setDoubleValueForKey(key, [object doubleValue]);
+}
+
+void WebPreferences::platformInitializeStore()
+{
+    if (!m_identifier)
+        return;
+
+#define INITIALIZE_PREFERENCE_FROM_NSUSERDEFAULTS(KeyUpper, KeyLower, TypeName, Type, DefaultValue) \
+    set##TypeName##ValueIfInUserDefaults(m_identifier, WebPreferencesKey::KeyLower##Key(), m_store);
+
+    FOR_EACH_WEBKIT_PREFERENCE(INITIALIZE_PREFERENCE_FROM_NSUSERDEFAULTS)
+
+#undef INITIALIZE_PREFERENCE_FROM_NSUSERDEFAULTS
+}
+
+void WebPreferences::platformUpdateStringValueForKey(const String& key, const String& value)
+{
+    if (!m_identifier)
+        return;
+
+    [[NSUserDefaults standardUserDefaults] setObject:nsStringFromWebCoreString(value) forKey:makeKey(m_identifier, key)];
+}
+
+void WebPreferences::platformUpdateBoolValueForKey(const String& key, bool value)
+{
+    if (!m_identifier)
+        return;
+
+    [[NSUserDefaults standardUserDefaults] setBool:value forKey:makeKey(m_identifier, key)];
+}
+
+void WebPreferences::platformUpdateUInt32ValueForKey(const String& key, uint32_t value)
+{
+    if (!m_identifier)
+        return;
+
+    [[NSUserDefaults standardUserDefaults] setInteger:value forKey:makeKey(m_identifier, key)];
+}
+
+void WebPreferences::platformUpdateDoubleValueForKey(const String& key, double value)
+{
+    if (!m_identifier)
+        return;
+
+    [[NSUserDefaults standardUserDefaults] setDouble:value forKey:makeKey(m_identifier, key)];
+}
+
+} // namespace WebKit