EDK: Remove MOJO_SYSTEM_IMPL_EXPORT, system_impl_export.h, etc.

mojo/edk/system/shared_buffer_dispatcher.h

Index: mojo/edk/system/shared_buffer_dispatcher.h
diff --git a/mojo/edk/system/shared_buffer_dispatcher.h b/mojo/edk/system/shared_buffer_dispatcher.h
index 679d1103b00c05d306540273a1aba0d41ae98383..9032fa016637226cdcb5e0344622c5fca8fe6b06 100644
--- a/mojo/edk/system/shared_buffer_dispatcher.h
+++ b/mojo/edk/system/shared_buffer_dispatcher.h
@@ -8,7 +8,6 @@
 #include "mojo/edk/embedder/platform_shared_buffer.h"
 #include "mojo/edk/system/memory.h"
 #include "mojo/edk/system/simple_dispatcher.h"
-#include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
@@ -22,8 +21,7 @@ namespace system {
 // TODO(vtl): We derive from SimpleDispatcher, even though we don't currently
 // have anything that's waitable. I want to add a "transferrable" wait flag
 // (which would entail overriding |GetHandleSignalsStateImplNoLock()|, etc.).
-class MOJO_SYSTEM_IMPL_EXPORT SharedBufferDispatcher final
-    : public SimpleDispatcher {
+class SharedBufferDispatcher final : public SimpleDispatcher {
  public:
   // The default options to use for |MojoCreateSharedBuffer()|. (Real uses
   // should obtain this via |ValidateCreateOptions()| with a null |in_options|;