[Sheriff] Disable HeadlessWebContentsPDFPageSizeRoundingTest on Linux+Win

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

TBR=caseq@chromium.org

Bug: 1036627
Change-Id: I5dd30e331d8e9dc9d6860528b2d2ccf942c0e6ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980878
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727242}

headless/lib/headless_web_contents_browsertest.cc

@@ -472,9 +472,16 @@ class HeadlessWebContentsPDFPageSizeRoundingTest
   }
 };
 
+#if defined(OS_WIN) || defined(OS_LINUX)
+// Flaky on Win/Linux: crbug.com/1036627
+DISABLED_HEADLESS_ASYNC_DEVTOOLED_TEST_F(
+    HeadlessWebContentsPDFPageSizeRoundingTest);
+#else
 HEADLESS_ASYNC_DEVTOOLED_TEST_F(HeadlessWebContentsPDFPageSizeRoundingTest);
 #endif
 
+#endif  // BUILDFLAG(ENABLE_PRINTING)
+
 class HeadlessWebContentsSecurityTest
     : public HeadlessAsyncDevTooledBrowserTest,
       public security::ExperimentalObserver {