policy: Use PathClassLoader for loading the keyhandler

import com.android.server.policy.keyguard.KeyguardServiceDelegate.DrawnListener;

import com.android.server.statusbar.StatusBarManagerInternal;

import dalvik.system.DexClassLoader;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

import java.lang.reflect.Constructor;

import cyanogenmod.providers.CMSettings;

import dalvik.system.PathClassLoader;

/**

 * WindowManagerPolicy implementation for the Android phone UI.  This

                com.android.internal.R.string.config_deviceKeyHandlerClass);

        if (!deviceKeyHandlerLib.isEmpty() && !deviceKeyHandlerClass.isEmpty()) {

            DexClassLoader loader =  new DexClassLoader(deviceKeyHandlerLib,

                    new ContextWrapper(mContext).getCacheDir().getAbsolutePath(),

                    null,

                    ClassLoader.getSystemClassLoader());

            PathClassLoader loader =  new PathClassLoader(deviceKeyHandlerLib,

                    getClass().getClassLoader());

            try {

                Class<?> klass = loader.loadClass(deviceKeyHandlerClass);

                Constructor<?> constructor = klass.getConstructor(Context.class);