sheriff: mark StartupBrowserCreatorPickerTest.OpensPicker as flaky

Bug: 1126886
Change-Id: Ife50aeb7b592ef50a470b01e1b1d510f4cccd0b0
Tbr: jkrcal@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427210Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809967}

chrome/browser/ui/startup/startup_browser_creator_browsertest.cc

@@ -1929,7 +1929,8 @@ class StartupBrowserCreatorPickerTest : public InProcessBrowserTest {
   DISALLOW_COPY_AND_ASSIGN(StartupBrowserCreatorPickerTest);
 };
 
-IN_PROC_BROWSER_TEST_F(StartupBrowserCreatorPickerTest, OpensPicker) {
+// Flaky: https://crbug.com/1126886
+IN_PROC_BROWSER_TEST_F(StartupBrowserCreatorPickerTest, DISABLED_OpensPicker) {
   ASSERT_EQ(1u, chrome::GetTotalBrowserCount());
   base::CommandLine command_line(base::CommandLine::NO_PROGRAM);
   StartWithTwoProfiles(command_line);