-changed filenames to *.cc
-fixed issues with implicit casts causing build errors.
All other CL warnings were ignored as the original
code is not changed, merely moved.
BUG=webrtc:5724
NOPRESUBMIT=true
Review URL: https://codereview.webrtc.org/1857153002
Cr-Commit-Position: refs/heads/master@{#12307}
