EDK: Remove MOJO_SYSTEM_IMPL_EXPORT, system_impl_export.h, etc.

mojo/edk/system/endpoint_relayer.h

Index: mojo/edk/system/endpoint_relayer.h
diff --git a/mojo/edk/system/endpoint_relayer.h b/mojo/edk/system/endpoint_relayer.h
index f6e8c163cdc72addf72a5ff3a94dd3090b605bbe..d30816790abb17fd107714a9e03e53d6a076cf14 100644
--- a/mojo/edk/system/endpoint_relayer.h
+++ b/mojo/edk/system/endpoint_relayer.h
@@ -10,7 +10,6 @@
 #include "base/memory/ref_counted.h"
 #include "mojo/edk/system/channel_endpoint_client.h"
 #include "mojo/edk/system/mutex.h"
-#include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
@@ -20,8 +19,7 @@ class ChannelEndpoint;
 
 // This is a simple |ChannelEndpointClient| that just relays messages between
 // two |ChannelEndpoint|s (without the overhead of |MessagePipe|).
-class MOJO_SYSTEM_IMPL_EXPORT EndpointRelayer final
-    : public ChannelEndpointClient {
+class EndpointRelayer final : public ChannelEndpointClient {
  public:
   // A class that can inspect and optionally handle messages of type
   // |Type::ENDPOINT_CLIENT| received from either |ChannelEndpoint|.
@@ -31,7 +29,7 @@ class MOJO_SYSTEM_IMPL_EXPORT EndpointRelayer final
   //
   // Destructors may not call methods of the |EndpointRelayer| (nor of the
   // |ChannelEndpoint|s).
-  class MOJO_SYSTEM_IMPL_EXPORT Filter {
+  class Filter {
    public:
     virtual ~Filter() {}