Cancel out unwanted editor's css for autocomplete dialog

lib/ace/autocomplete/popup.js

@@ -43,7 +43,7 @@ var $singleLineEditor = function(el) {
     var renderer = new Renderer(el);
 
     renderer.$maxLines = 4;
-    
+
     var editor = new Editor(renderer);
 
     editor.setHighlightActiveLine(false);
@@ -59,13 +59,13 @@ var $singleLineEditor = function(el) {
 var AcePopup = function(parentNode) {
     var el = dom.createElement("div");
     var popup = new $singleLineEditor(el);
-    
+
     if (parentNode)
         parentNode.appendChild(el);
     el.style.display = "none";
     popup.renderer.content.style.cursor = "default";
     popup.renderer.setStyle("ace_autocomplete");
-    
+
     popup.setOption("displayIndentGuides", false);
 
     var noop = function(){};
@@ -155,11 +155,11 @@ var AcePopup = function(parentNode) {
     popup.getHoveredRow = function() {
         return hoverMarker.start.row;
     };
-    
+
     event.addListener(popup.container, "mouseout", hideHoverMarker);
     popup.on("hide", hideHoverMarker);
     popup.on("changeSelection", hideHoverMarker);
-    
+
     popup.session.doc.getLength = function() {
         return popup.data.length;
     };
@@ -203,7 +203,7 @@ var AcePopup = function(parentNode) {
     };
     bgTokenizer.$updateOnChange = noop;
     bgTokenizer.start = noop;
-    
+
     popup.session.$computeWidth = function() {
         return this.screenWidth = 0;
     }
@@ -211,7 +211,7 @@ var AcePopup = function(parentNode) {
     // public
     popup.isOpen = false;
     popup.isTopdown = false;
-    
+
     popup.data = [];
     popup.setData = function(list) {
         popup.data = list || [];
@@ -236,7 +236,7 @@ var AcePopup = function(parentNode) {
                 popup._signal("select");
         }
     };
-    
+
     popup.on("changeSelection", function() {
         if (popup.isOpen)
             popup.setRow(popup.selection.lead.row);
@@ -268,22 +268,22 @@ var AcePopup = function(parentNode) {
 
         el.style.display = "";
         this.renderer.$textLayer.checkForSizeChanges();
-        
+
         var left = pos.left;
         if (left + el.offsetWidth > screenWidth)
             left = screenWidth - el.offsetWidth;
-            
+
         el.style.left = left + "px";
-        
+
         this._signal("show");
         lastMouseEvent = null;
         popup.isOpen = true;
     };
-    
+
     popup.getTextLeftOffset = function() {
         return this.$borderSize + this.renderer.$padding + this.$imageSize;
     };
-    
+
     popup.$imageSize = 0;
     popup.$borderSize = 1;
 
@@ -304,6 +304,11 @@ dom.importCssString("\
     position: absolute;\
     z-index: 2;\
 }\
+.ace_editor.ace_autocomplete .ace_scroller {\
+   background: none;\
+   border: none;\
+   box-shadow: none;\
+}\
 .ace_rightAlignedText {\
     color: gray;\
     display: inline-block;\