Reason for revert:
Breaks chrome rolls
Original issue's description:
> Setting is_component_build to false by default
>
> Webrtc does not support component builds so we want to override
> the chromium default value (which can be true on debug builds if the
> os is different from iOS).
>
> Please note that the user can set this value to true in two ways:
>
> - using --args (e.g.: gn gen out/default --args='is_component_build=true'
> - changing the value in the args.gn file
>
> But in both cases the value will be ignored because we don't use the
> 'component' template but we rely directly on 'rtc_static_library' and
> 'rtc_shared_library'.
>
> BUG=webrtc:6975
> NOTRY=True
>
> Review-Url: https://codereview.webrtc.org/2728643003
> Cr-Commit-Position: refs/heads/master@{#17020}
> Committed: 2cb3944ba7
TBR=kjellander@webrtc.org,mbonadei@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6975
Review-Url: https://codereview.webrtc.org/2731703004
Cr-Commit-Position: refs/heads/master@{#17025}
Name: WebRTC URL: http://www.webrtc.org Version: 90 License: BSD License File: LICENSE Description: WebRTC provides real time voice and video processing functionality to enable the implementation of PeerConnection/MediaStream. Third party code used in this project is described in the file LICENSE_THIRD_PARTY.