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This is phase 6.2 on the design document [1].

CL moves RTCCertificateGenerator directly to blink/renderer, once its
solely clients all reside in blink/renderer now.
The existing base class WebRTCCertificateGenerator, needed to bridge
between blink and content will be removed in a follow up step.

The CL also removes the existing accessor in blink::Platform, and
removes Mock implementations in
//content/test/test_blink_web_unit_test_support.cc|h

BUG=787254
R=guidou@chromium.org, haraken@chromium.org

Change-Id: I7d065a3d9344d779c65938c174c74d82e71a8716
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814604
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704581}