LKGR finder: Remove no longer running WebRTC test
LKGR finder: Remove no longer running WebRTC test

The audio_e2e_test is no longer running after the recipe
switch of master.client.webrtc.

BUG=None
TEST=None

Review URL: https://codereview.chromium.org/296693012

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra