Enable BrowserFocusTest.FocusOnNavigate on Windows.

The test harness is less flaky now, so perhaps this can run reliably.

BUG=665296
R=sky@chromium.org

Change-Id: Iae61f9aa6cce8eaa4d99ed2cf7d8794e9dec1094
Reviewed-on: https://chromium-review.googlesource.com/774599Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517187}

chrome/browser/ui/browser_focus_uitest.cc

@@ -663,8 +663,8 @@ IN_PROC_BROWSER_TEST_F(BrowserFocusTest, NavigateFromOmniboxIntoNewTab) {
   EXPECT_FALSE(IsViewFocused(VIEW_ID_OMNIBOX));
 }
 
-// Flaky on Windows and Mac (http://crbug.com/665296).
-#if defined(OS_WIN) || defined(OS_MACOSX)
+// Flaky on Mac (http://crbug.com/665296).
+#if defined(OS_MACOSX)
 #define MAYBE_FocusOnNavigate DISABLED_FocusOnNavigate
 #else
 #define MAYBE_FocusOnNavigate FocusOnNavigate