EDK: Remove MOJO_SYSTEM_IMPL_EXPORT, system_impl_export.h, etc.

mojo/edk/system/local_message_pipe_endpoint.h

Index: mojo/edk/system/local_message_pipe_endpoint.h
diff --git a/mojo/edk/system/local_message_pipe_endpoint.h b/mojo/edk/system/local_message_pipe_endpoint.h
index 879aa77ef1341cc8620e7537642cef193689dc8d..ac90b68d4e4fd06f01652619b81c6d4cc3cce962 100644
--- a/mojo/edk/system/local_message_pipe_endpoint.h
+++ b/mojo/edk/system/local_message_pipe_endpoint.h
@@ -9,14 +9,12 @@
 #include "mojo/edk/system/handle_signals_state.h"
 #include "mojo/edk/system/message_in_transit_queue.h"
 #include "mojo/edk/system/message_pipe_endpoint.h"
-#include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
 namespace system {
 
-class MOJO_SYSTEM_IMPL_EXPORT LocalMessagePipeEndpoint final
-    : public MessagePipeEndpoint {
+class LocalMessagePipeEndpoint final : public MessagePipeEndpoint {
  public:
   // If |message_queue| is non-null, its contents will be taken as the queue of
   // (already-received) messages.