Make AXProviderTest.HelloWorld bail without oopifs.

components/html_viewer/ax_provider_apptest.cc

Index: components/html_viewer/ax_provider_apptest.cc
diff --git a/components/html_viewer/ax_provider_apptest.cc b/components/html_viewer/ax_provider_apptest.cc
index c7ab838685c9a9b650cd7c45ba5ae5bdae10f423..a4e8cb0a341ef3538bac2cc761326f6bd56a3bb8 100644
--- a/components/html_viewer/ax_provider_apptest.cc
+++ b/components/html_viewer/ax_provider_apptest.cc
@@ -57,6 +57,10 @@ class TestFrameTreeServer : public mandoline::FrameTreeServer {
 using AXProviderTest = ViewManagerTestBase;
 
 TEST_F(AXProviderTest, HelloWorld) {
+  // TODO(msw|sky): Fix flaky timeouts without oopifs; http://crbug.com/504917
+  if (!EnableOOPIFs())
+    return;
+
   // Start a test server for net/data/test.html access.
   net::SpawnedTestServer server(
       net::SpawnedTestServer::TYPE_HTTP, net::SpawnedTestServer::kLocalhost,