EDK: Remove MOJO_SYSTEM_IMPL_EXPORT, system_impl_export.h, etc.

mojo/edk/embedder/slave_process_delegate.h

Index: mojo/edk/embedder/slave_process_delegate.h
diff --git a/mojo/edk/embedder/slave_process_delegate.h b/mojo/edk/embedder/slave_process_delegate.h
index cef5e0d39326795b82eb9d96e43ac0ee2df358a2..281c55939fd12530e3d3f86d715147f5ba649399 100644
--- a/mojo/edk/embedder/slave_process_delegate.h
+++ b/mojo/edk/embedder/slave_process_delegate.h
@@ -6,7 +6,6 @@
 #define MOJO_EDK_EMBEDDER_SLAVE_PROCESS_DELEGATE_H_
 
 #include "mojo/edk/embedder/process_delegate.h"
-#include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
@@ -14,7 +13,7 @@ namespace embedder {
 
 // An interface for the slave process delegate (which lives in each slave
 // process).
-class MOJO_SYSTEM_IMPL_EXPORT SlaveProcessDelegate : public ProcessDelegate {
+class SlaveProcessDelegate : public ProcessDelegate {
  public:
   ProcessType GetType() const override;