Disable SadTabViewInteractiveUITest.ReloadMultipleSadTabs in Win+official builds

It was recently enabled in
https://chromium-review.googlesource.com/c/chromium/src/+/1076594, but
it does not pass. I have not debugged it, I'm just trying to get things
back to green now that we are running this test more widely.

TBR=sky@chromium.org, thakis@chromium.org
BUG=848049

Change-Id: Ic0842dce2ddc10951b28e3e095f746c06076ecfe
Reviewed-on: https://chromium-review.googlesource.com/1080073Reviewed-by: Reid Kleckner <rnk@chromium.org>
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563043}

chrome/browser/ui/views/sad_tab_view_interactive_uitest.cc

@@ -177,6 +177,9 @@ IN_PROC_BROWSER_TEST_F(SadTabViewInteractiveUITest,
 #if defined(OS_MACOSX)
 // Focusing or input is not completely working on Mac: http://crbug.com/824418
 #define MAYBE_ReloadMultipleSadTabs DISABLED_ReloadMultipleSadTabs
+#elif defined(OS_WIN) && defined(OFFICIAL_BUILD)
+// Test seems to fail only in official Windows builds: http://crbug.com/848049
+#define MAYBE_ReloadMultipleSadTabs DISABLED_ReloadMultipleSadTabs
 #else
 #define MAYBE_ReloadMultipleSadTabs ReloadMultipleSadTabs
 #endif