Ignoring a couple of alert tests in marionette.

Author: barancev

java/client/test/org/openqa/selenium/AlertsTest.java

@@ -169,7 +169,7 @@ public void testShouldAllowAUserToSetTheValueOfAPrompt() {
     wait.until(textInElementLocated(By.id("text"), "cheese"));
   }
 
-  @Ignore(CHROME)
+  @Ignore({CHROME, MARIONETTE})
   @JavascriptEnabled
   @Test
   public void testSettingTheValueOfAnAlertThrows() {
@@ -346,6 +346,7 @@ public void testHandlesTwoAlertsFromOneInteraction() {
 
   @JavascriptEnabled
   @Test
+  @Ignore({CHROME, MARIONETTE})
   public void testShouldHandleAlertOnPageLoad() {
     driver.findElement(By.id("open-page-with-onload-alert")).click();