Disable flaky test EmulatedTouchPinchGoesToMainFrame

Bug: 1156243,1086625
Change-Id: I098ee3dab3aa31f84398bc92b7e2d185a8558521
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593557
Commit-Queue: Liviu Tinta <liviutinta@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837327}

content/browser/site_per_process_hit_test_browsertest.cc

@@ -2054,8 +2054,9 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessEmulatedTouchBrowserTest,
   RunTest(ScrollBubbling);
 }
 
+// TODO(crbug.com/1156243): Disabled as flaky because of crrev.com/c/2562796
 IN_PROC_BROWSER_TEST_F(SitePerProcessEmulatedTouchBrowserTest,
-                       EmulatedTouchPinchGoesToMainFrame) {
+                       DISABLED_EmulatedTouchPinchGoesToMainFrame) {
   RunTest(PinchGoesToMainFrame);
 }