Disable all the browser_tests that are flaking more than 5% of the time on trybots.

chrome/browser/extensions/lazy_background_page_apitest.cc

Index: chrome/browser/extensions/lazy_background_page_apitest.cc
diff --git a/chrome/browser/extensions/lazy_background_page_apitest.cc b/chrome/browser/extensions/lazy_background_page_apitest.cc
index dc87a82b702d0e0c05d7e9f883e5ef57230206f2..37c106b34f2b47746950c5c064685ab8fbfcd21c 100644
--- a/chrome/browser/extensions/lazy_background_page_apitest.cc
+++ b/chrome/browser/extensions/lazy_background_page_apitest.cc
@@ -337,16 +337,10 @@ IN_PROC_BROWSER_TEST_F(LazyBackgroundPageApiTest, MAYBE_WaitForNTP) {
   EXPECT_FALSE(IsBackgroundPageAlive(last_loaded_extension_id()));
 }
 
-// See crbug.com/248437
-#if defined(OS_WIN)
-#define MAYBE_IncognitoSplitMode DISABLED_IncognitoSplitMode
-#else
-#define MAYBE_IncognitoSplitMode IncognitoSplitMode
-#endif
-
 // Tests that an incognito split mode extension gets 2 lazy background pages,
 // and they each load and unload at the proper times.
-IN_PROC_BROWSER_TEST_F(LazyBackgroundPageApiTest, MAYBE_IncognitoSplitMode) {
+// See crbug.com/248437
+IN_PROC_BROWSER_TEST_F(LazyBackgroundPageApiTest, DISABLED_IncognitoSplitMode) {
   // Open incognito window.
   Browser* incognito_browser = ui_test_utils::OpenURLOffTheRecord(
       browser()->profile(), GURL("about:blank"));