remove unused base class ExecutorBase (#43828)

paddle/fluid/framework/new_executor/standalone_executor.h

@@ -18,21 +18,18 @@
 #include <unordered_map>
 #include <vector>
 
+#include "paddle/fluid/framework/lod_tensor.h"
 #include "paddle/fluid/framework/new_executor/interpretercore.h"
+#include "paddle/fluid/framework/new_executor/new_executor_defs.h"
+#include "paddle/fluid/framework/program_desc.h"
+#include "paddle/fluid/platform/place.h"
 
 namespace paddle {
 namespace framework {
 
-class ExecutorBase {
- public:
-  virtual ~ExecutorBase() {}
-  virtual paddle::framework::FetchList Run(
-      const std::vector<std::string>& feed_names,
-      const std::vector<framework::LoDTensor>& feed_tensors,
-      const std::vector<std::string>& fetch_names) = 0;
-};
+class InterpreterCore;
 
-class StandaloneExecutor : public ExecutorBase {
+class StandaloneExecutor {
  public:
   StandaloneExecutor(const platform::Place& place,
                      const ProgramDesc& startup_prog,