Adding codec constraints page to webrtc.

Delete videoCall page to avoid duplication. 

Bug: webrtc:653087
Change-Id: If44bed19c4323231e9a4348814f19c9694c17a36
Reviewed-on: https://chromium-review.googlesource.com/616770
Commit-Queue: Charu Jain <[email protected]>
Reviewed-by: Ned Nguyen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#494835}
6 files changed