Disable HeadlessWebContentsTest.Focus

Disable this test as it consistently failed on Win10 and Win7.

Tbr: irisu@chromium.org
Bug: 828042
Change-Id: I5366a98999fca0911ae018a94ca479a3e6a308d9
Reviewed-on: https://chromium-review.googlesource.com/992881Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547749}

headless/lib/headless_web_contents_browsertest.cc

@@ -322,7 +322,14 @@ IN_PROC_BROWSER_TEST_F(HeadlessNoDevToolsTabSocketTest, Test) {
   RunAsynchronousTest();
 }
 
-IN_PROC_BROWSER_TEST_F(HeadlessWebContentsTest, Focus) {
+#if defined(OS_WIN)
+// crbug.com/828042
+#define MAYBE_Focus DISABLED_Focus
+#else
+#define MAYBE_Focus Focus
+#endif
+
+IN_PROC_BROWSER_TEST_F(HeadlessWebContentsTest, MAYBE_Focus) {
   EXPECT_TRUE(embedded_test_server()->Start());
 
   HeadlessBrowserContext* browser_context =