Reland: Use native (optimized) functions for byte order conversion. (patchset #1 id:1 of https://codereview.webrtc.org/2755103002/ )

Reason for revert:
The problem with the internal project has been solved according to mbonadei@

Original issue's description:
> Revert of Reland: Use native (optimized) functions for byte order conversion. (patchset #5 id:80001 of https://codereview.webrtc.org/2751403003/ )
>
> Reason for revert:
> Breaks internal project.
>
> Original issue's description:
> > Reland: Use native (optimized) functions for byte order conversion.
> >
> > Instead of manually copying single bytes, the native functions like "htobe32"
> > are used.
> >
> > The previous CL https://codereview.webrtc.org/2738063005/ got reverted in
> > https://codereview.webrtc.org/2757703002/
> >
> > Reland with the compilation errors fixed.
> >
> > BUG=None
> >
> > Review-Url: https://codereview.webrtc.org/2751403003
> > Cr-Commit-Position: refs/heads/master@{#17280}
> > Committed: https://chromium.googlesource.com/external/webrtc/+/c8a4c1f24ca3a2ececeb1b3774e1fc80f8ffe631
>
> TBR=tommi@webrtc.org,jbauch@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=None
>
> Review-Url: https://codereview.webrtc.org/2755103002
> Cr-Commit-Position: refs/heads/master@{#17282}
> Committed: https://chromium.googlesource.com/external/webrtc/+/44122bd0f96b30983091f5be26b57e45f6cc9e33

TBR=tommi@webrtc.org,kthelgason@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=None

Review-Url: https://codereview.webrtc.org/2786993003
Cr-Original-Commit-Position: refs/heads/master@{#17479}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 5533bd36fed28fbb62ce5c09923605bf5e0f94d8
2 files changed