Disable flaky SystemDisplayApiTest.SetDisplay on Windows

TBR=stevenjb@chromium.org

Bug: 866904
Change-Id: Iec0f3ffc77048afa1947605e9488860c7bcc08df
Reviewed-on: https://chromium-review.googlesource.com/1148548Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577556}

extensions/browser/api/system_display/system_display_apitest.cc

@@ -244,7 +244,13 @@ IN_PROC_BROWSER_TEST_F(SystemDisplayApiTest, GetDisplayInfo) {
 
 #if !defined(OS_CHROMEOS)
 
-IN_PROC_BROWSER_TEST_F(SystemDisplayApiTest, SetDisplay) {
+// TODO(crbug.com/866904): Fails sometimes on Win 10 dbg bots.
+#if defined(OS_WIN)
+#define MAYBE_SetDisplay DISABLED_SetDisplay
+#else
+#define MAYBE_SetDisplay SetDisplay
+#endif  // defined(OS_WIN)
+IN_PROC_BROWSER_TEST_F(SystemDisplayApiTest, MAYBE_SetDisplay) {
   scoped_refptr<SystemDisplaySetDisplayPropertiesFunction> set_info_function(
       new SystemDisplaySetDisplayPropertiesFunction());