Dúvida Aula 1: Criando um projeto de teste.

Alguém poderia me ajudar ?? Tentei usar o ChromeDriver no lugar do driver do Firefox.

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;

public class TesteAutomatizado {

    public static void main(String[] args) {
        // abre firefox
        WebDriver driver = new ChromeDriver();

        // acessa o site do google
        driver.get("http://www.google.com.br/");

        // digita no campo "q" do google
        WebElement query = driver.findElement(By.name("q"));
        query.sendKeys("Caelum");

        // submete o form
        query.submit();

    }
}

E retornou o seguinte erro:

Exception in thread "main" java.lang.Error: Unresolved compilation problems: WebDriver cannot be resolved to a type ChromeDriver cannot be resolved to a type WebElement cannot be resolved to a type By cannot be resolved

at TesteAutomatizado.main(TesteAutomatizado.java:10)