Mac: Prevent NTP mousewheel events from being suppressed on Lion.

chrome/browser/resources/ntp4/tile_page.js

Index: chrome/browser/resources/ntp4/tile_page.js
diff --git a/chrome/browser/resources/ntp4/tile_page.js b/chrome/browser/resources/ntp4/tile_page.js
index 7a79c0b757441221b8012c2bf134401242fea7cd..5c91e4c1c92d2ed33bbbe111bc329bce84cd2f75 100644
--- a/chrome/browser/resources/ntp4/tile_page.js
+++ b/chrome/browser/resources/ntp4/tile_page.js
@@ -399,7 +399,7 @@ cr.define('ntp', function() {
   TilePage.prototype = {
     __proto__: HTMLDivElement.prototype,
 
-    initialize: function() {
+    initialize: function(ignoreMouseWheelEvents) {
       this.className = 'tile-page';
 
       // Div that acts as a custom scrollbar. The scrollbar has to live
@@ -448,7 +448,6 @@ cr.define('ntp', function() {
       this.addEventListener('DOMNodeInsertedIntoDocument',
                             this.onNodeInsertedIntoDocument_);
 
-      this.addEventListener('mousewheel', this.onMouseWheel_);
       this.content_.addEventListener('scroll', this.onScroll_.bind(this));
 
       this.dragWrapper_ = new cr.ui.DragWrapper(this.tileGrid_, this);
@@ -1053,31 +1052,6 @@ cr.define('ntp', function() {
     },
 
     /**
-     * Scrolls the page in response to a mousewheel event.
-     * @param {Event} e The mousewheel event.
-     */
-    handleMouseWheel: function(e) {
-      this.content_.scrollTop -= e.wheelDeltaY / 3;
-    },
-
-    /**
-     * Handles mouse wheels on |this|. We handle this explicitly because we want
-     * a consistent experience whether the user scrolls on the page or on the
-     * page switcher (handleMouseWheel provides a common conversion factor
-     * between wheel delta and scroll delta).
-     * @param {Event} e The mousewheel event.
-     * @private
-     */
-    onMouseWheel_: function(e) {
-      if (e.wheelDeltaY == 0)
-        return;
-
-      this.handleMouseWheel(e);
-      e.preventDefault();
-      e.stopPropagation();
-    },
-
-    /**
      * Handler for the 'scroll' event on |content_|.
      * @param {Event} e The scroll event.
      * @private