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}

modules/utility/source/process_thread_impl.cc

@@ -124,8 +124,10 @@ void ProcessThreadImpl::RegisterModule(Module* module,
     rtc::CritScope lock(&lock_);
     for (const ModuleCallback& mc : modules_) {
       RTC_DCHECK(mc.module != module)
-          << "Already registered here: " << mc.location.ToString() << "\n"
-          << "Now attempting from here: " << from.ToString();
+          << "Already registered here: " << mc.location.ToString()
+          << "\n"
+             "Now attempting from here: "
+          << from.ToString();
     }
   }
 #endif