go/test: fixing gn issue
go/test: fixing gn issue

GN issue:
ERROR at //mojo/go/c_embedder/c_embedder.cc:7:11: Can't include this header from here.
#include "base/memory/scoped_ptr.h"
          ^-----------------------
The target:
  //mojo/go:system_test_static_library
is including a file from the target:
  //base/memory:memory

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/1065653008

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