Disable BrowserFocusTest.FindFocusTest on Chrome OS

Bug:816645
Change-Id: Ifecbd85be7b27e5193d63089a1e0222c3674d1c9

TBR=sky@chromium.org

Change-Id: Ifecbd85be7b27e5193d63089a1e0222c3674d1c9
Reviewed-on: https://chromium-review.googlesource.com/938387
Commit-Queue: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Reviewed-by: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539279}

chrome/browser/ui/browser_focus_uitest.cc

@@ -493,7 +493,7 @@ IN_PROC_BROWSER_TEST_F(BrowserFocusTest, InterstitialFocus) {
 }
 
 // Test that find-in-page UI can request focus, even when it is already open.
-#if defined(OS_MACOSX)
+#if defined(OS_MACOSX) || defined(OS_CHROMEOS)
 #define MAYBE_FindFocusTest DISABLED_FindFocusTest
 #else
 // If this flakes, disable and log details in http://crbug.com/523255.