import org.chromium.chrome.shell.ChromeShellActivity;
import org.chromium.chrome.shell.ChromeShellTestBase;
import org.chromium.content.browser.NavigationClient;
import org.chromium.chrome.shell.ChromeShellActivity;
import org.chromium.chrome.shell.ChromeShellTestBase;
import org.chromium.content.browser.NavigationClient;
import org.chromium.content.browser.test.util.Criteria;
import org.chromium.content.browser.test.util.CriteriaHelper;
import org.chromium.content.browser.test.util.Criteria;
import org.chromium.content.browser.test.util.CriteriaHelper;
// Exists solely to expose protected methods to this test.
private static class TestNavigationHistory extends NavigationHistory {
@Override
// Exists solely to expose protected methods to this test.
private static class TestNavigationHistory extends NavigationHistory {
@Override