Disable flaky test SubFrameDirectDownload

TBR=msramek@chromium.org
NOTRY=true

Bug: 736354
Change-Id: I4d6ddca7c5cb167d6f39da22a63fba7eac54e00e
Reviewed-on: https://chromium-review.googlesource.com/545735Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481879}

chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc

@@ -1155,9 +1155,14 @@ IN_PROC_BROWSER_TEST_F(SBNavigationObserverBrowserTest,
                            referrer_chain.Get(2));
 }
 
+#if defined(OS_WIN)
+#define MAYBE_SubFrameDirectDownload DISABLED_SubFrameDirectDownload
+#else
+#define MAYBE_SubFrameDirectDownload SubFrameDirectDownload
+#endif
 // Click a link in a subframe and start download.
 IN_PROC_BROWSER_TEST_F(SBNavigationObserverBrowserTest,
-                       SubFrameDirectDownload) {
+                       MAYBE_SubFrameDirectDownload) {
   GURL initial_url = embedded_test_server()->GetURL(kSingleFrameTestURL);
   ClickTestLink("sub_frame_download_attribution", 1, initial_url);
   std::string test_name =