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diff --git a/Source/WebKit2/UIProcess/Plugins/mac/PluginInfoStoreMac.mm b/Source/WebKit2/UIProcess/Plugins/mac/PluginInfoStoreMac.mm
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+++ b/Source/WebKit2/UIProcess/Plugins/mac/PluginInfoStoreMac.mm
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+/*
+ * Copyright (C) 2010 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 "PluginInfoStore.h"
+
+#include "NetscapePluginModule.h"
+#include "WebKitSystemInterface.h"
+#include <WebCore/WebCoreNSStringExtras.h>
+#include <wtf/HashSet.h>
+#include <wtf/RetainPtr.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+Vector<String> PluginInfoStore::pluginsDirectories()
+{
+    Vector<String> pluginsDirectories;
+
+    pluginsDirectories.append([NSHomeDirectory() stringByAppendingPathComponent:@"Library/Internet Plug-Ins"]);
+    pluginsDirectories.append("/Library/Internet Plug-Ins");
+    
+    return pluginsDirectories;
+}
+
+// FIXME: Once the UI process knows the difference between the main thread and the web thread we can drop this and just use
+// String::createCFString.
+static CFStringRef safeCreateCFString(const String& string)
+{
+    return CFStringCreateWithCharacters(0, reinterpret_cast<const UniChar*>(string.characters()), string.length());
+}
+    
+Vector<String> PluginInfoStore::pluginPathsInDirectory(const String& directory)
+{
+    Vector<String> pluginPaths;
+
+    RetainPtr<CFStringRef> directoryCFString(AdoptCF, safeCreateCFString(directory));
+    
+    NSArray *filenames = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:(NSString *)directoryCFString.get() error:nil];
+    for (NSString *filename in filenames)
+        pluginPaths.append([(NSString *)directoryCFString.get() stringByAppendingPathComponent:filename]);
+    
+    return pluginPaths;
+}
+
+Vector<String> PluginInfoStore::individualPluginPaths()
+{
+    return Vector<String>();
+}
+
+bool PluginInfoStore::getPluginInfo(const String& pluginPath, Plugin& plugin)
+{
+    return NetscapePluginModule::getPluginInfo(pluginPath, plugin);
+}
+
+bool PluginInfoStore::shouldUsePlugin(const Plugin& plugin)
+{
+    for (size_t i = 0; i < m_plugins.size(); ++i) {
+        const Plugin& loadedPlugin = m_plugins[i];
+
+        // If a plug-in with the same bundle identifier already exists, we don't want to load it.
+        if (loadedPlugin.bundleIdentifier == plugin.bundleIdentifier)
+            return false;
+    }
+
+    return true;
+}
+
+String PluginInfoStore::getMIMETypeForExtension(const String& extension)
+{
+    // FIXME: This should just call MIMETypeRegistry::getMIMETypeForExtension and be
+    // strength reduced into the callsite once we can safely convert String
+    // to CFStringRef off the main thread.
+
+    RetainPtr<CFStringRef> extensionCFString(AdoptCF, safeCreateCFString(extension));
+    return WKGetMIMETypeForExtension((NSString *)extensionCFString.get());
+}
+
+} // namespace WebKit