Fixing UNHANDLED_PROMPT_BEHAVIOUR capability to work in legacy browsers

Author: barancev

java/client/src/org/openqa/selenium/remote/DesiredCapabilities.java

@@ -152,6 +152,7 @@ public void setCapability(String key, Object value) {
         capabilities.put(key, value);
       }
     } else if (UNEXPECTED_ALERT_BEHAVIOUR.equals(key)) {
+      capabilities.put(UNEXPECTED_ALERT_BEHAVIOUR, value);
       capabilities.put(UNHANDLED_PROMPT_BEHAVIOUR, value);
     } else {
       capabilities.put(key, value);

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

@@ -23,7 +23,6 @@
 import static org.openqa.selenium.WaitingConditions.elementTextToEqual;
 import static org.openqa.selenium.remote.CapabilityType.UNEXPECTED_ALERT_BEHAVIOUR;
 import static org.openqa.selenium.testing.Driver.CHROME;
-import static org.openqa.selenium.testing.Driver.HTMLUNIT;
 import static org.openqa.selenium.testing.Driver.IE;
 import static org.openqa.selenium.testing.Driver.MARIONETTE;
 import static org.openqa.selenium.testing.Driver.PHANTOMJS;