Making ECDSA the default certificate regardless of WEBRTC_CHROMIUM_BUILD.
Making ECDSA the default certificate regardless of WEBRTC_CHROMIUM_BUILD.

Due to the experiment in chromium relying on KT_DEFAULT = KT_RSA (bug:
crbug.com/611698) a conditional was introduced. Now that the experiment is
ending and the experiment flag has been removed we can make KT_DEFAULT=KT_ECDSA
unconditionally.

BUG=chromium:611698

Review-Url: https://codereview.webrtc.org/2009533003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12935}

TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc