Enable browser_tests with Ozone CrOS.

chrome/browser/extensions/api/desktop_capture/desktop_capture_apitest.cc

Index: chrome/browser/extensions/api/desktop_capture/desktop_capture_apitest.cc
diff --git a/chrome/browser/extensions/api/desktop_capture/desktop_capture_apitest.cc b/chrome/browser/extensions/api/desktop_capture/desktop_capture_apitest.cc
index a81d0d37e1d6ac99c69fc0c3c060e2223dda1cd6..da76a6d0982d640442417d913b4ce7336f7b9f14 100644
--- a/chrome/browser/extensions/api/desktop_capture/desktop_capture_apitest.cc
+++ b/chrome/browser/extensions/api/desktop_capture/desktop_capture_apitest.cc
@@ -171,7 +171,8 @@ class DesktopCaptureApiTest : public ExtensionApiTest {
 }  // namespace
 
 // Flaky on Windows: http://crbug.com/301887
-#if defined(OS_WIN)
+// Fails on Ozone Chrome OS: http://crbug.com/718512
+#if defined(OS_WIN) || (defined(OS_CHROMEOS) && defined(USE_OZONE))
 #define MAYBE_ChooseDesktopMedia DISABLED_ChooseDesktopMedia
 #else
 #define MAYBE_ChooseDesktopMedia ChooseDesktopMedia