Revert "Flipping the direction of WheelEvent.deltaX/Y to follow standards"

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index f2f1d73194219eb6e503bbbe6a14b48342242c6d..08cbe48100ecbbc0d7dc14bc98805c648dffd6f6 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -24671,13 +24671,6 @@ class WheelEvent extends MouseEvent native "*WheelEvent" {
       eventType = 'MouseScrollEvents';
     }
     final event = document.$dom_createEvent(eventType);
-    // If polyfilling, then flip these because we'll flip them back to match
-    // the W3C standard:
-    // http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-WheelEvent-deltaY
-    if (JS('bool', '#.deltaY === undefined', event)) {
-      deltaX = -deltaX;
-      deltaY = -deltaY;
-    }
     if (event._hasInitWheelEvent) {
       var modifiers = [];
       if (ctrlKey) {
@@ -24747,14 +24740,6 @@ class WheelEvent extends MouseEvent native "*WheelEvent" {
   void $dom_initWebKitWheelEvent(int wheelDeltaX, int wheelDeltaY, Window view, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey) native;
 
 
-  /**
-   * The amount that is expected to scroll vertically, in units determined by
-   * [deltaMode].
-   *
-   * See also:
-   *
-   * * [WheelEvent.deltaY](http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-WheelEvent-deltaY) from the W3C.
-   */
   @DomName('WheelEvent.deltaY')
   num get deltaY {
     if (JS('bool', '#.deltaY !== undefined', this)) {
@@ -24762,7 +24747,7 @@ class WheelEvent extends MouseEvent native "*WheelEvent" {
       return this._deltaY;
     } else if (JS('bool', '#.wheelDelta !== undefined', this)) {
       // Chrome and IE
-      return -this._wheelDelta;
+      return this._wheelDelta;
     } else if (JS('bool', '#.detail !== undefined', this)) {
       // Firefox
 
@@ -24773,9 +24758,9 @@ class WheelEvent extends MouseEvent native "*WheelEvent" {
         // Firefox is normally the number of lines to scale (normally 3)
         // so multiply it by 40 to get pixels to move, matching IE & WebKit.
         if (detail < 100) {
-          return -detail * 40;
+          return detail * 40;
         }
-        return -detail;
+        return detail;
       }
       return 0;
     }
@@ -24783,14 +24768,6 @@ class WheelEvent extends MouseEvent native "*WheelEvent" {
         'deltaY is not supported');
   }
 
-  /**
-   * The amount that is expected to scroll horizontally, in units determined by
-   * [deltaMode].
-   *
-   * See also:
-   *
-   * * [WheelEvent.deltaX](http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-WheelEvent-deltaX) from the W3C.
-   */
   @DomName('WheelEvent.deltaX')
   num get deltaX {
     if (JS('bool', '#.deltaX !== undefined', this)) {
@@ -24798,7 +24775,7 @@ class WheelEvent extends MouseEvent native "*WheelEvent" {
       return this._deltaX;
     } else if (JS('bool', '#.wheelDeltaX !== undefined', this)) {
       // Chrome
-      return -this._wheelDeltaX;
+      return this._wheelDeltaX;
     } else if (JS('bool', '#.detail !== undefined', this)) {
       // Firefox and IE.
       // IE will have detail set but will not set axis.
@@ -24811,9 +24788,9 @@ class WheelEvent extends MouseEvent native "*WheelEvent" {
         // Firefox is normally the number of lines to scale (normally 3)
         // so multiply it by 40 to get pixels to move, matching IE & WebKit.
         if (detail < 100) {
-          return -detail * 40;
+          return detail * 40;
         }
-        return -detail;
+        return detail;
       }
       return 0;
     }