Point to new channel file behind CDN

[jsecretan]

Test Plan

brave/brave-core#1575

Description

In order to make the channels file faster and more reliable for the browser to retrieve, the devops team has put it behind the CDN and defaulted the file to being gzip compressed at the edge. To ensure that both versions can run uninterrupted for existing clients, there is a new subdomain to retrieve the file. Please change the URLs to request channel files to the following:

Staging: https://publishers-staging-distro.basicattentiontoken.org/api/v1/public/channels
Production: https://publishers-distro.basicattentiontoken.org/api/v1/public/channels

Keep in mind that to take advantage of the gzipping, you need to send a ""Accept-Encoding: gzip" header and confirm that the file is uncompressed client side.

[LaurenWags]

@NejcZdovc could you clarify which flags I should be using in the terminal? I'm launching with /Applications/Brave\ Browser\ Beta.app/Contents/MacOS/Brave\ Browser\ Beta --v=3 --vmodule=*rewards*=6 but maybe I'm missing a necessary flag. I'm trying to follow the test plan in brave/brave-core#1575 with

Brave	0.60.28 Chromium: 72.0.3626.96 (Official Build) beta(64-bit)
Revision	84098ee7ef8622a9defc2ef043cd8930b617b10e-refs/branch-heads/3626@{#836}
OS	Mac OS X

The only item I see about the publisher list is [55344:26115:0213/173234.735493:ERROR:rewards_service_impl.cc(165)] Failed to read file: /Users/laurenwagner/Library/Application Support/BraveSoftware/Brave-Browser-Beta/Default/publishers_list

[LaurenWags]

Verified passed with

Brave	0.60.28 Chromium: 72.0.3626.96 (Official Build) beta(64-bit)
Revision	84098ee7ef8622a9defc2ef043cd8930b617b10e-refs/branch-heads/3626@{#836}
OS	Mac OS X

• Verified test plan in Use CDN for publisher list brave-core#1575. Launched Brave with --enable-logging=stderr --v=1 --vmodule=*rewards*=6. Verified I saw this Request in the terminal:

[ REQUEST ]
> url: https://publishers-distro.basicattentiontoken.org/api/v1/public/channels
> method: GET
> content: 
> contentType: 
> headers: Accept-Encoding: gzip
[ END REQUEST ]

Verification passed on

Brave	0.60.29 Chromium: 72.0.3626.96 (Official Build) beta (64-bit)
Revision	84098ee7ef8622a9defc2ef043cd8930b617b10e-refs/branch-heads/3626@{#836}
OS	Windows 10

• Verified test plan in Use CDN for publisher list brave-core#1575, Launched Brave with --enable-logging=stderr --v=0 --vmodule=*rewards*=5
  

Verification passed on

Brave	0.60.34 Chromium: 72.0.3626.109 (Official Build) beta(64-bit)
Revision	fae8db7ab9280fa6704a59980263c804f809ebd5-refs/branch-heads/3626@{#857}
OS	Linux