Make LicenseActivity app compat

import com.android.contacts.common.R;

import android.app.ActionBar;

import android.app.Activity;

import android.support.v7.app.ActionBar;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.MenuItem;

import android.webkit.WebView;

/**

 * Displays the licenses for all open source libraries.

 */

public class LicenseActivity extends Activity {

public class LicenseActivity extends AppCompatActivity {

    private static final String LICENSE_FILE = "file:///android_asset/licenses.html";

    private WebView mWebView;

        setContentView(R.layout.licenses);

        mWebView = (WebView) findViewById(R.id.webview);

        mWebView.loadUrl(LICENSE_FILE);

        final ActionBar actionBar = getActionBar();

        final ActionBar actionBar = getSupportActionBar();

        if (actionBar != null) {

            actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP, ActionBar.DISPLAY_HOME_AS_UP);

        }