[Sheriff] Disable DontBlockWebContentsOpenTest.RunAsyncTest on Win+Linux

Flakily crashes. Can't revert suspect. See bug for details.

TBR=caseq@chromium.org

Bug: 1036627
Change-Id: Icfc07fb0005854d0bc5270f45fd783472c1a3de3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980351Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727164}

headless/lib/headless_web_contents_browsertest.cc

@@ -963,7 +963,12 @@ class DontBlockWebContentsOpenTest : public WebContentsOpenTest {
   }
 };
 
+#if defined(OS_WIN) || defined(OS_LINUX)
+// Flaky on Win/Linux: crbug.com/1036627
+DISABLED_HEADLESS_ASYNC_DEVTOOLED_TEST_F(DontBlockWebContentsOpenTest);
+#else
 HEADLESS_ASYNC_DEVTOOLED_TEST_F(DontBlockWebContentsOpenTest);
+#endif
 
 class BlockWebContentsOpenTest : public WebContentsOpenTest {
  public: