Migrate chromevox classic tests

Change-Id: I8d8b30665ac9627c010002561e710449311a952b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879333
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709354}

diff --git a/BUILD.gn b/BUILD.gn
index 770262b..b79e2fb 100644
--- a/BUILD.gn
+++ b/BUILD.gn

@@ -149,7 +149,8 @@
       "//tools/polymer:polymer_tools_python_unittests",
       "//ui/accessibility:accessibility_perftests",
       "//ui/accessibility:accessibility_unittests",
-      "//ui/accessibility/extensions",
+      "//ui/accessibility/extensions:extension_tests",
+      "//ui/accessibility/extensions:extensions",
     ]
   }