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/function_view_unittest.cc

@@ -73,7 +73,7 @@ TEST(FunctionViewTest, Null) {
   EXPECT_FALSE(rtc::FunctionView<int()>(nullptr));
 
   // This calls the constructor for function pointers.
-  EXPECT_FALSE(rtc::FunctionView<int()>(reinterpret_cast<int(*)()>(0)));
+  EXPECT_FALSE(rtc::FunctionView<int()>(reinterpret_cast<int (*)()>(0)));
 }
 
 // Ensure that FunctionView handles move-only arguments and return values.