Disable NativeWidgetMacTest.VisibleAfterNativeParentDeminiaturize on 10.10

It flakes out on 10.10 (only) at a sufficiently annoying rate.

TBR=tapted@chromium.org,ellyjones@chromium.org

Bug: 777247
Change-Id: I01fb8f576804f76f419976825d68c711aa81d964
Reviewed-on: https://chromium-review.googlesource.com/746382
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512766}

ui/views/widget/native_widget_mac_unittest.mm

@@ -807,6 +807,10 @@ TEST_F(NativeWidgetMacTest, VisibleAfterNativeParentShow) {
 // deminiaturize on the parent window (after attempting to show the child while
 // the parent was miniaturized).
 TEST_F(NativeWidgetMacTest, VisibleAfterNativeParentDeminiaturize) {
+  // Disabled on 10.10 due to flakes. See http://crbug.com/777247.
+  if (base::mac::IsOS10_10())
+    return;
+
   NSWindow* native_parent = MakeNativeParent();
   [native_parent makeKeyAndOrderFront:nil];
   [native_parent miniaturize:nil];