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This CL prepares for later renaming updateIce to setConfiguration in
Blink, once it has an Intent to Ship.

updateIce was never functional in the first place (in the native webrtc
library), always throwing the same exception. SetConfiguration is
functional, and will allow an application to change the set of ICE
servers and ICE candidate policy. Soon, also the ICE candidate pool
size.

updateIce will no longer be tracked after this CL, which should be ok
since it has always been nonfunctional and stats show zero use.

BUG=chromium:587453

Review-Url: https://codereview.chromium.org/2511633002
Cr-Commit-Position: refs/heads/master@{#438206}