Replicate to all renderers the accepted languages set by a layout test.

components/test_runner/layout_test_runtime_flags.cc

Index: components/test_runner/layout_test_runtime_flags.cc
diff --git a/components/test_runner/layout_test_runtime_flags.cc b/components/test_runner/layout_test_runtime_flags.cc
index 96da30e2162b2c21867093584a104534cf4873d4..7c9f89f3d19c881197465112400f975bc11cd9e2 100644
--- a/components/test_runner/layout_test_runtime_flags.cc
+++ b/components/test_runner/layout_test_runtime_flags.cc
@@ -28,6 +28,8 @@ void LayoutTestRuntimeFlags::Reset() {
   set_policy_delegate_should_notify_done(false);
   set_wait_until_done(false);
 
+  set_accept_languages("");
+
   // No need to report the initial state - only the future delta is important.
   tracked_dictionary().ResetChangeTracking();
 }