Don't reset touch-action zoom state at scrollers

third_party/WebKit/Source/web/tests/data/touch-action-tests.css

 /*
    Use a class to apply touch-action so that we can easily manually check
    the tests for consistent behavior on IE10 as well.
 */
 * /deep/ .ta-none {
   -ms-touch-action: none;
   touch-action: none;
 }
 .ta-auto {
   -ms-touch-action: auto;
@@ skipping 52 matching lines @@
   /* Use fixed line height so co-ordinates will be similar in test and browser */
   font-size: 20px;
   line-height: 1;
   white-space: nowrap;
 }
 
 .scroll {
   overflow: scroll;
   height: 50px;
 }
+iframe {
+  height: 50px;
+  display: block;
+  margin: 5px;
+}
 .spacer {
   height: 500px;
 }
 
 .marker {
   position: absolute;
   opacity: 0.5;
   /* Note, if changing size, be sure to change kMarkerSize in JS too */
   width: 6px;
   height: 6px;
   background-color: red;
 }