tree 6756aced541d5988bc193515adbce2df19bcf77f
parent 6cf180b636acbf9771184baeb8e637545f1e463e
author danzh <danzh@google.com> 1556203661 -0700
committer Copybara-Service <copybara-worker@google.com> 1556224466 -0700

gfe-relnote: n/a(new class type not in use) Add SimpleLinkedHashMap which is
forked from chromium linked_hash_map.h.

This class is not used in google3, but used by other platform, i.e.
chromium, envoy, etc.

PiperOrigin-RevId: 245234098
Change-Id: Id453c101c9d191ae509ceb4f92c85a7486802e60