Revert of Replace the remaining scoped_ptr with unique_ptr in webrtc/modules/

webrtc/modules/utility/source/process_thread_impl.cc

Index: webrtc/modules/utility/source/process_thread_impl.cc
diff --git a/webrtc/modules/utility/source/process_thread_impl.cc b/webrtc/modules/utility/source/process_thread_impl.cc
index 68c7ab676d6a7fadade0cc5c3ff115b7a57d55e7..8cdf01634cb483d8925cc6f86c22f50dac77c4ad 100644
--- a/webrtc/modules/utility/source/process_thread_impl.cc
+++ b/webrtc/modules/utility/source/process_thread_impl.cc
@@ -36,9 +36,9 @@
 ProcessThread::~ProcessThread() {}
 
 // static
-std::unique_ptr<ProcessThread> ProcessThread::Create(
+rtc::scoped_ptr<ProcessThread> ProcessThread::Create(
     const char* thread_name) {
-  return std::unique_ptr<ProcessThread>(new ProcessThreadImpl(thread_name));
+  return rtc::scoped_ptr<ProcessThread>(new ProcessThreadImpl(thread_name));
 }
 
 ProcessThreadImpl::ProcessThreadImpl(const char* thread_name)
@@ -119,7 +119,7 @@
   wake_up_->Set();
 }
 
-void ProcessThreadImpl::PostTask(std::unique_ptr<ProcessTask> task) {
+void ProcessThreadImpl::PostTask(rtc::scoped_ptr<ProcessTask> task) {
   // Allowed to be called on any thread.
   {
     rtc::CritScope lock(&lock_);