Fix bug 42957 - make enter/return work properly in the XPInstall dialog. r=dveditz a=dveditz

xpinstall/res/content/institems.js

@@ -56,7 +56,7 @@ function onLoad()
 	var moduleName;
 	var URL;
     var numberOfDialogTreeElements;
-
+              doSetOKCancel(onOk, cancel);
 	param = window.arguments[0].QueryInterface( Components.interfaces.nsIDialogParamBlock  );
 	if( !param )
 	{

xpinstall/res/content/institems.xul

@@ -74,10 +74,7 @@ Contributor(s):
         </box>
 
         <separator align="center" class="groove" flex="100%"/>
-        <box class="selection" id="okcancelBox">
+        <box class="selection" id="okCancelButtonsRight"/>
-            <button class="dialog push" id="start" default="true" value="&dialogOk.label;" onclick="onOk();"/> 
-            <button class="dialog push" id="cancel" value="&dialogCancel.label;"  onclick="cancel();" />
-        </box>
     </box>