Delete deprecated PlatformThread looping

Bug: webrtc:10594, webrtc:7187
Change-Id: Icba3a5cf6dbe817ead427c27645b3ad7bc8819be
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/134642
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27833}
diff --git a/modules/utility/source/process_thread_impl.h b/modules/utility/source/process_thread_impl.h
index 7339fe1..0b44340 100644
--- a/modules/utility/source/process_thread_impl.h
+++ b/modules/utility/source/process_thread_impl.h
@@ -42,7 +42,7 @@
   void DeRegisterModule(Module* module) override;
 
  protected:
-  static bool Run(void* obj);
+  static void Run(void* obj);
   bool Process();
 
  private: