Mark test as flaky.

BUG=871910
TBR=pkasting@chromium.org
NOTRY=true

Change-Id: I4c1100d7b95e654edeaa9b416c2cf9b0f6759339
Reviewed-on: https://chromium-review.googlesource.com/1165829Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581317}

chrome/browser/infobars/infobars_browsertest.cc

@@ -108,7 +108,8 @@ class InfoBarsTest : public InProcessBrowserTest {
   }
 };
 
-IN_PROC_BROWSER_TEST_F(InfoBarsTest, TestInfoBarsCloseOnNewTheme) {
+// Flakes with a crash on Win10. https://crbug.com/871910
+IN_PROC_BROWSER_TEST_F(InfoBarsTest, FLAKY_TestInfoBarsCloseOnNewTheme) {
   extensions::ScopedTestDialogAutoConfirm auto_confirm(
       extensions::ScopedTestDialogAutoConfirm::ACCEPT);
   ASSERT_TRUE(embedded_test_server()->Start());