Selenium Java - ChromeDriver - Getting rid of an alert

Question

I am trying to get rif od an alert as displayed in the image:

This alert can be easily dismmised by pressing escape or return keys. But I cannot get it done using selenium.

First, I am switching to the window using:

m_parentWindowHandler = m_chromeWebdriver.getWindowHandle();
.
.
.
m_chromeWebdriver.switchTo().window(m_parentWindowHandler);

Then I tried

    Actions action = new Actions(m_chromeWebdriver);
    action.sendKeys(Keys.RETURN).build().perform();

(also with Keys.ESCAPE)