This test is flaky on https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.10

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2d2278d629232c59a9de3b2ac742b391afa99f70

commit 2d2278d629232c59a9de3b2ac742b391afa99f70
Author: Kevin McNee <mcnee@chromium.org>
Date: Wed Oct 11 16:17:31 2017

Disable virtual/mojo-loading/http/tests/media/autoplay-crossorigin.html on Mac.

TBR=zqzhang@chromium.org

No-Presubmit: true
No-Tree-Checks: true
No-Try: true

Bug: 772411
Change-Id: I932dae367bef3b24ac8fa27740e8a9c7726f7535
Reviewed-on: https://chromium-review.googlesource.com/712705
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#507996}
[modify] https://crrev.com/2d2278d629232c59a9de3b2ac742b391afa99f70/third_party/WebKit/LayoutTests/TestExpectations

Sample output

--- /b/s/w/iozVPU6O/layout-test-results/retry_1/http/tests/media/autoplay-crossorigin-expected.txt
+++ /b/s/w/iozVPU6O/layout-test-results/retry_1/http/tests/media/autoplay-crossorigin-actual.txt
@@ -4,6 +4,6 @@
 This is a testharness.js-based test.
 Harness Error. harness_status.status = 1 , harness_status.message = 1 duplicate test name: "test that muted video in cross-origin iframe should autoplay"
 PASS test that muted video in cross-origin iframe should autoplay
-PASS test that muted video in cross-origin iframe should autoplay
+FAIL test that muted video in cross-origin iframe should autoplay assert_greater_than_equal: expected a number greater than or equal to 4 but got 3
 Harness: the test ran to completion.
 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/62481f74ddd504070c34867a9edcc9db240d7f05

commit 62481f74ddd504070c34867a9edcc9db240d7f05
Author: Dominic Battre <battre@chromium.org>
Date: Mon Oct 23 12:11:50 2017

http/tests/media/autoplay-crossorigin.html flakes on all platforms

TBR=zqzhang@chromium.org

Bug: 772411
Change-Id: If20e91a61fb4c2305a4e4b9723149a4d7e5a7274
Reviewed-on: https://chromium-review.googlesource.com/732984
Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510771}
[modify] https://crrev.com/62481f74ddd504070c34867a9edcc9db240d7f05/third_party/WebKit/LayoutTests/TestExpectations

Assigning to beccahughes@ as they know own autoplay work. Though, the x-origin autoplay experiment did not launch and will probably not so maybe not something to fix soon as we might as well disable the whole feature.

 Issue 781891  has been merged into this issue.