Building on FreeBSD

@clifton @mbacchi look here: https://svnweb.freebsd.org/ports/head/www/chromium/

The Makefile downloads the chromium source code and apply the patches in files/ directory, then builds the chromium source. I can just download with make fetch and apply patches with make patch, then I believe I could run the Brave build process with no problems.

But to be able to do it, I need to pass the freebsd’s chromium already patched directory to Brave build process rather than Brave using depot_tools to download original chromium source.

If I remove depot_tools from .gitmodules, it won’t change the build process to use patched chromium dir.

Any idea?