Bug 15604 Promote Fill arguments on method completion to a real preference
It is still in work in progress but it has become an established feature by now. Promote the preference to the code assist preference page.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferencesConstants.java
private PreferencesConstants() {
		super();
	}
	
	/**
	 * Enable / Disable showing the method return type. Boolean value.
	 */