[GPU] Remove unused FinalizeTrace

src/xenia/gpu/null/null_command_processor.cc

@@ -53,8 +53,6 @@ bool NullCommandProcessor::IssueCopy() { return true; }
 
 void NullCommandProcessor::InitializeTrace() {}
 
-void NullCommandProcessor::FinalizeTrace() {}
-
 }  // namespace null
 }  // namespace gpu
 }  // namespace xe

src/xenia/gpu/null/null_command_processor.h

@@ -46,7 +46,6 @@ class NullCommandProcessor : public CommandProcessor {
   bool IssueCopy() override;
 
   void InitializeTrace() override;
-  void FinalizeTrace() override;
 };
 
 }  // namespace null