Disable SaveHTMLOnlyTabDestroy on Win/Linux

Based on the flake-portal, the test
SavePageBrowserTest.SaveHTMLOnlyTabDestroy
is also flaky on Windows and Linux's release bot. Disable the test on
those platforms.

Bug: 580766
TBR: qinmin@chromium.org
Change-Id: I813fb92b70358da9acee5a88007bb399a3d5e1a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397240
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804932}

chrome/browser/download/save_page_browsertest.cc

@@ -534,8 +534,9 @@ class DelayingDownloadManagerDelegate : public ChromeDownloadManagerDelegate {
   DISALLOW_COPY_AND_ASSIGN(DelayingDownloadManagerDelegate);
 };
 
-// Disabled on ChromeOS due to flakiness. crbug.com/580766
-#if defined(OS_CHROMEOS)
+// Disabled on multiple platforms due to flakiness. crbug.com/580766
+#if defined(OS_CHROMEOS) || \
+    (defined(OS_WIN) || defined(OS_LINUX)) && defined(NDEBUG)
 #define MAYBE_SaveHTMLOnlyTabDestroy DISABLED_SaveHTMLOnlyTabDestroy
 #else
 #define MAYBE_SaveHTMLOnlyTabDestroy SaveHTMLOnlyTabDestroy