Chrome Version: M62, Master revision adb61db1 (#508578)
OS: Windows 10 64-bit

What steps will reproduce the problem?
(1) Load https://yep.video.yahoo.com/js/3/videoplayer-min.js?r=nextgen-desktop&lang=en-US&ypv=prod in an application based on the Content API (not Chromium/Chrome).

What is the expected result?
The URL should load.

What happens instead?
The URL fails to load with ERR_CONTENT_DECODING_FAILED.

Please use labels and text to provide additional information.
Yahoo's server ignores the "Accept-Encoding" value when the "User-Agent" string specifies Chrome (see below).

Starting with  issue #452335  Chrome/Chromium enables Brotli by default from chrome/browser/net/default_network_context_params.cc CreateDefaultNetworkContextParams. We should instead enable Brotli by default from ContentBrowserClient::CreateNetworkContext so that it applies to all Content API-based applications.

This problem is similar in concept to  issue #746421 .

$ curl -v "https://yep.video.yahoo.com/js/3/videoplayer-min.js?r=nextgen-desktop&lang=en-US&ypv=prod" -H "Accept-Encoding:gzip, deflate" -H "User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.0 Safari/537.36" > /dev/null

<deleted lines>
> GET /js/3/videoplayer-min.js?r=nextgen-desktop&lang=en-US&ypv=prod HTTP/1.1
> Host: yep.video.yahoo.com
> Accept: */*
> Accept-Encoding:gzip, deflate
> User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.0 Safari/537.36
>
< HTTP/1.1 200 OK
< X-Frame-Options: SAMEORIGIN
< X-Content-Type-Options: nosniff
< X-XSS-Protection: 1; mode=block
< X-Powered-By: Express
< Cache-Control: private, max-age=600
< Content-Type: text/javascript; charset=utf-8
< ETag: W/"d9944-bZZ3vnMSH6ehfe5xIlnFyOchuYo"
< x-mh2-env: videoplayer.yep;yep-appproductionbf1;prod_bf1_1;650361ca-c5a7-11e7-a1d9-d4ae5297450a;main
< Date: Mon, 13 Nov 2017 21:44:42 GMT
< Age: 241
< Via: http/1.1 a84.ue.bf1.yahoo.net (ApacheTrafficServer [cSsSfU]), http/1.1 media-ncache19.prod.media.bf1.yahoo.com (ApacheTrafficServer [cMsSf ]), http/1.1 media-ncache19.prod.media.bf1.yahoo.com (ApacheTrafficServer [cRs f ]), http/1.1 media-ncache7.prod.media.bf1.yahoo.com (ApacheTrafficServer [cMsSf ]), http/1.1 media-router18.prod.media.bf1.yahoo.com (ApacheTrafficServer [cRs f ]), http/1.1 e14.ycpi.cha.yahoo.com (ApacheTrafficServer [cMsSf ])
< Server: ATS
< Public-Key-Pins-Report-Only: max-age=2592000; pin-sha256="2oALgLKofTmeZvoZ1y/fSZg7R9jPMix8eVA6DH4o/q8="; pin-sha256="cAajgxHlj7GTSEIzIYIQxmEloOSoJq7VOaxWHfv72QM="; pin-sha256="SVqWumuteCQHvVIaALrOZXuzVVVeS7f4FGxxu6V+es4="; pin-sha256="UZJDjsNp1+4M5x9cbbdflB779y5YRBcV6Z6rBMLIrO4="; pin-sha256="JbQbUG5JMJUoI6brnx0x3vZF6jilxsapbXGVfjhN8Fg="; pin-sha256="lnsM2T/O9/J84sJFdnrpsFp3awZJ+ZZbYpCWhGloaHI="; pin-sha256="h6801m+z8v3zbgkRHpq6L29Esgfzhj89C1SyUCOQmqU="; pin-sha256="SQVGZiOrQXi+kqxcvWWE96HhfydlLVqFr4lQTqI5qqo="; pin-sha256="q5hJUnat8eyv8o81xTBIeB5cFxjaucjmelBPT2pRMo8="; pin-sha256="vPtEqrmtAhAVcGtBIep2HIHJ6IlnWQ9vlK50TciLePs="; pin-sha256="lpkiXF3lLlbN0y3y6W0c/qWqPKC7Us2JM8I7XCdEOCA="; pin-sha256="r/mIkG3eEpVdm+u/ko/cwxzOMo1bk4TyHIlByibiA5E="; pin-sha256="WoiWRyIOVNa9ihaBciRSC7XHjliYS9VwUGOIud4PB18="; pin-sha256="2fRAUXyxl4A1/XHrKNBmc8bTkzA7y4FB/GLJuNAzCqY="; pin-sha256="dolnbtzEBnELx/9lOEQ22e6OZO/QNb6VSSX2XHA3E7A="; includeSubdomains; report-uri="http://csp.yahoo.com/beacon/csp?src=yahoocom-hpkp-report-only"
< Content-Encoding: br
< Content-Length: 214213
< X-Bypass-Ssl-Transform: 1
< Vary: Accept-Encoding, bucket, X-Yahoo-Dc-Device-Type, X-Yahoo-Dc-Os-Name,X-Ssl
< Connection: keep-alive
<

$ curl -v "https://yep.video.yahoo.com/js/3/videoplayer-min.js?r=nextgen-desktop&lang=en-US&ypv=prod" -H "Accept-Encoding:gzip, deflate" > /dev/null

<deleted lines>
> GET /js/3/videoplayer-min.js?r=nextgen-desktop&lang=en-US&ypv=prod HTTP/1.1
> Host: yep.video.yahoo.com
> User-Agent: curl/7.46.0
> Accept: */*
> Accept-Encoding:gzip, deflate
>
< HTTP/1.1 200 OK
< X-Frame-Options: SAMEORIGIN
< X-Content-Type-Options: nosniff
< X-XSS-Protection: 1; mode=block
< X-Powered-By: Express
< Cache-Control: private, max-age=600
< Content-Type: text/javascript; charset=utf-8
< ETag: W/"d993b-zIJHyDZpPDsMwWeC6HCZBgELUOs"
< Content-Encoding: gzip
< x-mh2-env: videoplayer.yep;yep-appproductionbf1;prod_bf1_1;65013ee8-c5a7-11e7-a1d9-d4ae5297450a;main
< Date: Mon, 13 Nov 2017 21:49:02 GMT
< Age: 79
< Via: http/1.1 a14.ue.bf1.yahoo.net (ApacheTrafficServer [cMsSfW]), http/1.1 media-ncache19.prod.media.bf1.yahoo.com (ApacheTrafficServer [cSsSfU]), http/1.1 media-ncache19.prod.media.bf1.yahoo.com (ApacheTrafficServer [cHs f ]), http/1.1 media-ncache3.prod.media.bf1.yahoo.com (ApacheTrafficServer [cMsSf ]), http/1.1 media-router61.prod.media.bf1.yahoo.com (ApacheTrafficServer [cMsSfW]), http/1.1 e16.ycpi.cha.yahoo.com (ApacheTrafficServer [cMsSf ])
< Server: ATS
< Public-Key-Pins-Report-Only: max-age=2592000; pin-sha256="2oALgLKofTmeZvoZ1y/fSZg7R9jPMix8eVA6DH4o/q8="; pin-sha256="cAajgxHlj7GTSEIzIYIQxmEloOSoJq7VOaxWHfv72QM="; pin-sha256="SVqWumuteCQHvVIaALrOZXuzVVVeS7f4FGxxu6V+es4="; pin-sha256="UZJDjsNp1+4M5x9cbbdflB779y5YRBcV6Z6rBMLIrO4="; pin-sha256="JbQbUG5JMJUoI6brnx0x3vZF6jilxsapbXGVfjhN8Fg="; pin-sha256="lnsM2T/O9/J84sJFdnrpsFp3awZJ+ZZbYpCWhGloaHI="; pin-sha256="h6801m+z8v3zbgkRHpq6L29Esgfzhj89C1SyUCOQmqU="; pin-sha256="SQVGZiOrQXi+kqxcvWWE96HhfydlLVqFr4lQTqI5qqo="; pin-sha256="q5hJUnat8eyv8o81xTBIeB5cFxjaucjmelBPT2pRMo8="; pin-sha256="vPtEqrmtAhAVcGtBIep2HIHJ6IlnWQ9vlK50TciLePs="; pin-sha256="lpkiXF3lLlbN0y3y6W0c/qWqPKC7Us2JM8I7XCdEOCA="; pin-sha256="r/mIkG3eEpVdm+u/ko/cwxzOMo1bk4TyHIlByibiA5E="; pin-sha256="WoiWRyIOVNa9ihaBciRSC7XHjliYS9VwUGOIud4PB18="; pin-sha256="2fRAUXyxl4A1/XHrKNBmc8bTkzA7y4FB/GLJuNAzCqY="; pin-sha256="dolnbtzEBnELx/9lOEQ22e6OZO/QNb6VSSX2XHA3E7A="; includeSubdomains; report-uri="http://csp.yahoo.com/beacon/csp?src=yahoocom-hpkp-report-only"
< Content-Length: 245811
< X-Bypass-Ssl-Transform: 1
< Vary: Accept-Encoding, bucket, X-Yahoo-Dc-Device-Type, X-Yahoo-Dc-Os-Name,X-Ssl
< Connection: keep-alive
<