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/audio_coding/neteq/delay_manager.cc

@@ -71,7 +71,8 @@ DelayHistogramConfig GetDelayHistogramConfig() {
     }
   }
   RTC_LOG(LS_INFO) << "Delay histogram config:"
-                   << " quantile=" << config.quantile
+                      " quantile="
+                   << config.quantile
                    << " forget_factor=" << config.forget_factor
                    << " start_forget_weight="
                    << config.start_forget_weight.value_or(0);