Concatenate string literals at compile time.

This CL was generated by running:
git ls-files | grep ".cc" | xargs perl -i -ne 'BEGIN {undef $/}; s/("[\s\n]*<<[\s\n]*")/" "/g; print;'; git cl format

After that I manually edited modules/audio_processing/gain_controller2.cc to preserve its original
formatting.

This primary benefit of this change is a small reduction in binary size.

Bug: None
Change-Id: I689fa7ba9c717c314bb167e5d592c3c4e0871e29
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/165961
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30251}
diff --git a/rtc_base/thread.cc b/rtc_base/thread.cc
index ba5b617..6c5830f 100644
--- a/rtc_base/thread.cc
+++ b/rtc_base/thread.cc
@@ -766,7 +766,7 @@
   RTC_DCHECK(!IsCurrent());
   if (Current() && !Current()->blocking_calls_allowed_) {
     RTC_LOG(LS_WARNING) << "Waiting for the thread to join, "
-                        << "but blocking calls have been disallowed";
+                           "but blocking calls have been disallowed";
   }
 
 #if defined(WEBRTC_WIN)