Brave should depend on upstream WebTorrent; Create de-facto "chromeapp" field in package.json spec

[feross]

To resolve #856 and obviate the need for Brave to use a WebTorrent fork, I'm attempting to make a defacto standard for specifying Chrome App dependency substitutions using the "chromeapp" field in package.json.

The "chromeapp" field is just like the "browser" field in package.json except it's intended for Chrome Apps instead of a generic browser environment. Bundler tools like browserify or webpack can be configured to look for the "chromeapp" field instead of the "browser" field when doing a build for a Chrome App.

In the case of WebTorrent running in a Chrome App context in Brave, we can use raw sockets, so we want to replace e.g. require('net') with require('chrome-net') and similar.

I'm sending PRs to all dependent projects:

• Add "chromeapp" field to package.json jscissr/http-node#2
• App "chromeapp" field to package.json webtorrent/webtorrent#1691
• Add "chromeapp" field to package.json webtorrent/torrent-discovery#45
• Add "chromeapp" field to package.json mafintosh/k-rpc-socket#17
• Add "chromeapp" field to package.json webtorrent/bittorrent-tracker#328

Once this is complete, we should be able to depend directly on upstream WebTorrent.

[feross]

All PRs have been merged, except for the one to http-node. I'm going to make webtorrent itself temporarily depend on an http-node fork so that we can make progress on this issue.

I'm about to send a PR to make Brave depend on upstream webtorrent, which should now have all the necessary chromeapp fields. 🎉

(I'll be responsible for updating webtorrent to use upstream http-node once they merge the PR.)

[kjozwiak]

Verification PASSED on macOS 10.14.6 x64 using the following build:

Brave	0.69.126 Chromium: 77.0.3865.65 (Official Build) (64-bit)
Revision	87a331a3169cab563505fb44011058b904011ba1-refs/branch-heads/3865@{#726}
OS	macOS Version 10.14.6 (Build 18G95)

• Verified the test case outlined under Depend on upstream WebTorrent brave-core#3134

Verification passed on

Brave	0.69.127 Chromium: 77.0.3865.75 (Official Build) (64-bit)
Revision	201e747d032611c5f2785cae06e894cf85be7f8a-refs/branch-heads/3865@{#776}
OS	Ubuntu 18.04 LTS

• Verified the test case outlined under Depend on upstream WebTorrent brave-core#3134

Verification passed o

Brave	0.69.128 Chromium: 77.0.3865.75 (Official Build) (64-bit)
Revision	201e747d032611c5f2785cae06e894cf85be7f8a-refs/branch-heads/3865@{#776}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified the test case outlined under Depend on upstream WebTorrent brave-core#3134