Reland of Modify profiles for H264 encode SW fallback (patchset #1 id:1 of https://codereview.webrtc.org/2995373002/ )

Reason for revert:
Fix and reland.

Original issue's description:
> Revert of Modify profiles for H264 encode SW fallback (patchset #2 id:20001 of https://codereview.webrtc.org/2997913003/ )
>
> Reason for revert:
> Breaks the internal bots.
> Root cause: The "public_deps" is defined behind an "if" condition which may not be true.
>
> Original issue's description:
> > Modify profiles for H264 encode SW fallback
> >
> > We have only Constrained Baseline profile available in SW encoder impl
> > so modify the profile to that in case  of a fallback
> >
> > BUG=chromium:735959
> >
> > Review-Url: https://codereview.webrtc.org/2997913003
> > Cr-Commit-Position: refs/heads/master@{#19436}
> > Committed: https://chromium.googlesource.com/external/webrtc/+/1fd66656b3754c22a43f4eded57e022916bb6064
>
> TBR=magjed@webrtc.org,emircan@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=chromium:735959
>
> Review-Url: https://codereview.webrtc.org/2995373002
> Cr-Commit-Position: refs/heads/master@{#19438}
> Committed: https://chromium.googlesource.com/external/webrtc/+/296b64eb25949d84d9cb85fce02e7ba05be9d419

TBR=magjed@webrtc.org,zhihuang@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:735959

Review-Url: https://codereview.webrtc.org/2997423002
Cr-Original-Commit-Position: refs/heads/master@{#19476}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 82fac89381b6981f3f9d83ce38100330c700433d
3 files changed