Disable ChromeMimeHandlerViewTest.GuestDevToolsReloadsEmbedder

This test is flaky on Win/Mac/Linux

TBR=wjmaclean@chromium.org

Bug: 1033009
Change-Id: I76a3a20d6f26109b3961f2329f0abed4b3c760b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612308Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840849}

chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_browsertest.cc

@@ -187,14 +187,9 @@ class StubDevToolsAgentHostClient : public content::DevToolsAgentHostClient {
 
 }  // namespace
 
-// Flaky on ChromeOS and Lacros (https://crbug.com/1033009)
-#if BUILDFLAG(IS_CHROMEOS_ASH) || BUILDFLAG(IS_CHROMEOS_LACROS)
-#define MAYBE_GuestDevToolsReloadsEmbedder DISABLED_GuestDevToolsReloadsEmbedder
-#else
-#define MAYBE_GuestDevToolsReloadsEmbedder GuestDevToolsReloadsEmbedder
-#endif
+// Flaky (https://crbug.com/1033009)
 IN_PROC_BROWSER_TEST_F(ChromeMimeHandlerViewTest,
-                       MAYBE_GuestDevToolsReloadsEmbedder) {
+                       DISABLED_GuestDevToolsReloadsEmbedder) {
   GURL data_url("data:application/pdf,foo");
   ui_test_utils::NavigateToURL(browser(), data_url);
   auto* embedder_web_contents =