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}

api/ortc/sessiondescription_unittest.cc

@@ -20,4 +20,4 @@ TEST_F(SessionDescriptionTest, CreateSessionDescription) {
   EXPECT_EQ(-1, s.session_id());
   EXPECT_EQ("0", s.session_version());
 }
-}
+}  // namespace webrtc

api/ortc/srtptransportinterface.h

@@ -11,9 +11,9 @@
 #ifndef API_ORTC_SRTPTRANSPORTINTERFACE_H_
 #define API_ORTC_SRTPTRANSPORTINTERFACE_H_
 
+#include "api/cryptoparams.h"
 #include "api/ortc/rtptransportinterface.h"
 #include "api/rtcerror.h"
-#include "api/cryptoparams.h"
 
 namespace webrtc {