Block renderer-initiated main frame navigations to data URLs

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 5537adb9736d822a7dccdb07df44e82a4808cf77..d4aa63118f8b3002439ae9e30b334608343c4dc7 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -622,6 +622,7 @@ test("content_browsertests") {
     "../browser/fileapi/file_system_browsertest.cc",
     "../browser/fileapi/fileapi_browsertest.cc",
     "../browser/find_request_manager_browsertest.cc",
+    "../browser/frame_host/data_url_navigation_browsertest.cc",
     "../browser/frame_host/form_submission_throttle_browsertest.cc",
     "../browser/frame_host/frame_tree_browsertest.cc",
     "../browser/frame_host/interstitial_page_impl_browsertest.cc",
@@ -996,6 +997,10 @@ test("content_browsertests") {
       # The cast shell media pipeline doesn't produce real video frames that we
       # can inspect.
       "../browser/media/media_color_browsertest.cc",
+
+      # The cast shell has plugin support but no pdf, causing data URL PDF tests
+      # to fail.
+      "../browser/frame_host/data_url_navigation_browsertest.cc",
     ]
   }
 }