jbauch c8a4c1f24c 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}
2017-03-17 05:49:50 +00:00
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