Delete ProcessThread creation from test TimeController as unused

Bug: webrtc:7219
Change-Id: Ia34f24a804b8a1e06b089774e37cac6e6d749e82
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/266366
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37311}

api/BUILD.gn

@@ -778,7 +778,6 @@ rtc_source_set("time_controller") {
   ]
 
   deps = [
-    "../modules/utility",
     "../rtc_base",
     "../rtc_base:threading",
     "../rtc_base/synchronization:yield_policy",

api/test/DEPS

@@ -30,7 +30,6 @@ specific_include_rules = {
     "+modules/audio_processing/include/audio_processing.h",
   ],
   "time_controller\.h": [
-    "+modules/utility/include/process_thread.h",
     "+rtc_base/synchronization/yield_policy.h",
     "+system_wrappers/include/clock.h",
   ],

api/test/time_controller.h

@@ -17,7 +17,6 @@
 #include "api/task_queue/task_queue_factory.h"
 #include "api/units/time_delta.h"
 #include "api/units/timestamp.h"
-#include "modules/utility/include/process_thread.h"
 #include "rtc_base/synchronization/yield_policy.h"
 #include "rtc_base/thread.h"
 #include "system_wrappers/include/clock.h"
@@ -41,9 +40,6 @@ class TimeController {
   // is destroyed.
   std::unique_ptr<TaskQueueFactory> CreateTaskQueueFactory();
 
-  // Creates a process thread.
-  virtual std::unique_ptr<ProcessThread> CreateProcessThread(
-      const char* thread_name) = 0;
   // Creates an rtc::Thread instance. If `socket_server` is nullptr, a default
   // noop socket server is created.
   // Returned thread is not null and started.