.config/google-chrome/ShaderCache/GPUCache/
.config/google-chrome/Default/GPUCache/
on top of that almost half of these folders in config chrome has a manifest and log which remains even if you use the clear browse data with all time.
.config/google-chrome/Default/data_reduction_proxy_leveldb/
also even with bleachbit there are still leftovers like some of these highlighted items. most of them are gone but not all
but the point is after i do a good cleanup i compress the
.mozilla
or .moonchild productions
or .config/google-chrome/
and on a fresh install of mint or whatever linux i just decompress it and i have my browser back. depending on how long it's been dormant some extensions may be dead and some tweaked settings may not work or redundant so some fixing may be required. my browser profiles are pretty old had them since chromium v18 i think and my firefox since firefox v3 . that's how i backup my bookmarks