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_receiver_unittest.cc

@@ -1235,8 +1235,8 @@ TEST_F(RtcpReceiverTest, HandlesInvalidTransportFeedback) {
 
   // Modify the TransportFeedback packet so that it is invalid.
   const size_t kStatusCountOffset = 14;
-  ByteWriter<uint16_t>::WriteBigEndian(
-      &built_packet.data()[kStatusCountOffset], 42);
+  ByteWriter<uint16_t>::WriteBigEndian(&built_packet.data()[kStatusCountOffset],
+                                       42);
 
   // Stress no transport feedback is expected.
   EXPECT_CALL(transport_feedback_observer_, OnTransportFeedback(_)).Times(0);