Disable flaky test WebViewScrollGuestContent/WebViewScrollGuestContentTest.ScrollGuestContent/0.

TBR=wjmaclean@chromium.org

Bug: 734308
Change-Id: I685c551e0c3b0ac820d8e052f6e20b69734ea5ee
Reviewed-on: https://chromium-review.googlesource.com/538541
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#480283}

chrome/browser/apps/guest_view/web_view_browsertest.cc

@@ -3935,7 +3935,13 @@ INSTANTIATE_TEST_CASE_P(WebViewScrollGuestContent,
                         WebViewScrollGuestContentTest,
                         testing::Values(false));
 
-IN_PROC_BROWSER_TEST_P(WebViewScrollGuestContentTest, ScrollGuestContent) {
+#if defined(OS_WIN)
+#define MAYBE_ScrollGuestContent DISABLED_ScrollGuestContent
+#else
+#define MAYBE_ScrollGuestContent ScrollGuestContent
+#endif
+IN_PROC_BROWSER_TEST_P(WebViewScrollGuestContentTest,
+                       MAYBE_ScrollGuestContent) {
   LoadAppWithGuest("web_view/scrollable_embedder_and_guest");
 
   content::WebContents* embedder_contents = GetEmbedderWebContents();