Add arthursonzogni@ OWNER of back_forward_cache_browsertest.cc

Bug: 511340
Change-Id: I5dc810270f2255516feaff4777650d01f2f9c5ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1749011
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686721}

content/browser/OWNERS

@@ -38,3 +38,6 @@ per-file builtin_service_manifests.cc=set noparent
 per-file builtin_service_manifests.cc=file://ipc/SECURITY_OWNERS
 per-file builtin_service_manifests.h=set noparent
 per-file builtin_service_manifests.h=file://ipc/SECURITY_OWNERS
+
+# BackForwardCache
+per-file back_forward_cache_browsertest.cc=arthursonzogni@chromium.org