[iOS] Add all headers to ios/third_party/earl_grey2/BUILD.gn

Bug: 906201
Change-Id: I3a75ee136390ce0f3d5ff0840cbb8eee005d5bd9
Reviewed-on: https://chromium-review.googlesource.com/c/1372716
Commit-Queue: Lindsay Pasricha <lindsayw@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616055}
1 file changed