Remove IPC::Endpoint.

ui/ozone/public/ozone_gpu_test_helper.cc

Index: ui/ozone/public/ozone_gpu_test_helper.cc
diff --git a/ui/ozone/public/ozone_gpu_test_helper.cc b/ui/ozone/public/ozone_gpu_test_helper.cc
index 92df52f991438241e257a47d0988cff7e6f89a81..c945b123260a5641d5b50583537a9e287d619550 100644
--- a/ui/ozone/public/ozone_gpu_test_helper.cc
+++ b/ui/ozone/public/ozone_gpu_test_helper.cc
@@ -65,11 +65,6 @@ class FakeGpuProcess : public IPC::Channel {
 
   void Close() override { NOTREACHED(); }
 
-  base::ProcessId GetPeerPID() const override {
-    NOTREACHED();
-    return base::kNullProcessId;
-  }
-
  private:
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 };