EDK: Remove MOJO_SYSTEM_IMPL_EXPORT, system_impl_export.h, etc.

mojo/edk/embedder/master_process_delegate.h

Index: mojo/edk/embedder/master_process_delegate.h
diff --git a/mojo/edk/embedder/master_process_delegate.h b/mojo/edk/embedder/master_process_delegate.h
index 031f3ba7bd2fd94925efaf8242dffccf8a873f2f..eb6fa620e032625b9f7653fe745b8eb392126ad5 100644
--- a/mojo/edk/embedder/master_process_delegate.h
+++ b/mojo/edk/embedder/master_process_delegate.h
@@ -7,7 +7,6 @@
 
 #include "mojo/edk/embedder/process_delegate.h"
 #include "mojo/edk/embedder/slave_info.h"
-#include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
@@ -15,7 +14,7 @@ namespace embedder {
 
 // An interface for the master process delegate (which lives in the master
 // process).
-class MOJO_SYSTEM_IMPL_EXPORT MasterProcessDelegate : public ProcessDelegate {
+class MasterProcessDelegate : public ProcessDelegate {
  public:
   ProcessType GetType() const override;