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}

rtc_base/helpers.h

@@ -36,7 +36,8 @@ bool CreateRandomString(size_t length, std::string* str);
 // number generator failed.
 // For ease of implementation, the function requires that the table
 // size evenly divide 256; otherwise, it returns false.
-bool CreateRandomString(size_t length, const std::string& table,
+bool CreateRandomString(size_t length,
+                        const std::string& table,
                         std::string* str);
 
 // Generates (cryptographically) random data of the given length.