Use StopChildProcess instead of base::KillProcess to kill a renderer process

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index b4e77d4f247b6c4113fc20c892ce4a83bca0c26d..9175a2c6c0dfa9cb58ad3bd60e59bd9a8347543e 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -104,6 +104,7 @@ class CONTENT_EXPORT RenderProcessHostImpl
   int VisibleWidgetCount() const override;
   bool IsIsolatedGuest() const override;
   StoragePartition* GetStoragePartition() const override;
+  bool Shutdown(int exit_code, bool wait) override;
   bool FastShutdownIfPossible() override;
   void DumpHandles() override;
   base::ProcessHandle GetHandle() const override;