Reformat the WebRTC code base

Running clang-format with chromium's style guide.

The goal is n-fold:
 * providing consistency and readability (that's what code guidelines are for)
 * preventing noise with presubmit checks and git cl format
 * building on the previous point: making it easier to automatically fix format issues
 * you name it

Please consider using git-hyper-blame to ignore this commit.

Bug: webrtc:9340
Change-Id: I694567c4cdf8cee2860958cfe82bfaf25848bb87
Reviewed-on: https://webrtc-review.googlesource.com/81185
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23660}

modules/rtp_rtcp/source/rtcp_transceiver_impl_unittest.cc

@@ -246,7 +246,6 @@ TEST(RtcpTransceiverImplTest, SendsNoRtcpWhenNetworkStateIsDown) {
   config.outgoing_transport = &mock_transport;
   RtcpTransceiverImpl rtcp_transceiver(config);
 
-
   EXPECT_CALL(mock_transport, SendRtcp(_, _)).Times(0);
 
   const uint8_t raw[] = {1, 2, 3, 4};