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_packet.cc

@@ -75,8 +75,8 @@ void RtcpPacket::CreateHeader(
   RTC_DCHECK_LE(count_or_format, 0x1f);
   constexpr uint8_t kVersionBits = 2 << 6;
   constexpr uint8_t kNoPaddingBit = 0 << 5;
-  buffer[*pos + 0] = kVersionBits | kNoPaddingBit |
-                     static_cast<uint8_t>(count_or_format);
+  buffer[*pos + 0] =
+      kVersionBits | kNoPaddingBit | static_cast<uint8_t>(count_or_format);
   buffer[*pos + 1] = packet_type;
   buffer[*pos + 2] = (length >> 8) & 0xff;
   buffer[*pos + 3] = length & 0xff;