Rever reset-scroll-X

src/service/viewport/viewport-binding-natural.js

@@ -56,12 +56,6 @@ export class ViewportBindingNatural_ {
     /** @private @const {!Observable} */
     this.resizeObservable_ = new Observable();
 
-    /**
-     * See `handleScrollEvent_` for details.
-     * @private @const {boolean}
-     */
-    this.resetScrollX_ = this.platform_.isIos() && this.win.parent !== this.win;
-
     /** @const {function()} */
     this.boundScrollEventListener_ = this.handleScrollEvent_.bind(this);
 
@@ -74,16 +68,6 @@ export class ViewportBindingNatural_ {
 
   /** @private */
   handleScrollEvent_() {
-    if (
-      this.resetScrollX_ &&
-      this.getScrollingElement()./*OK*/ scrollLeft > 0
-    ) {
-      // In the iframed iOS Safari case the `touch-action` and
-      // `overscroll-behavior` are not observed which leads to the overscroll
-      // bugs on the horizontal axis. The solution is to reset the horizontal
-      // scrolling in this case. See b/140131460 for more details.
-      this.getScrollingElement()./*OK*/ scrollLeft = 0;
-    }
     this.scrollObservable_.fire();
   }
 

test/unit/test-viewport-binding.js

@@ -251,18 +251,6 @@ describes.realWin('ViewportBindingNatural on iOS', {ampCss: true}, env => {
     binding = new ViewportBindingNatural_(ampdoc);
     binding.connect();
   });
-
-  it('should reset overscroll on X-axis', () => {
-    win.scrollTo(1, 0);
-    expect(win.pageXOffset).to.equal(1);
-    return new Promise(resolve => {
-      win.addEventListener('scroll', () => {
-        if (win.pageXOffset == 0) {
-          resolve();
-        }
-      });
-    });
-  });
 });
 
 describes.realWin('ViewportBindingIosEmbedWrapper', {ampCss: true}, env => {