Stop linking in the old Mojo EDK.

mojo/edk/embedder/embedder_internal.h

Index: mojo/edk/embedder/embedder_internal.h
diff --git a/mojo/edk/embedder/embedder_internal.h b/mojo/edk/embedder/embedder_internal.h
index 7a0b39508446fefc3c04c57769e34ab5fcd5e536..12e9fdb1d49bced099a4bb35d97111a4222ecdd2 100644
--- a/mojo/edk/embedder/embedder_internal.h
+++ b/mojo/edk/embedder/embedder_internal.h
@@ -35,14 +35,11 @@ extern Broker* g_broker;
 extern PlatformSupport* g_platform_support;
 
 // Instance of |Core| used by the system functions (|Mojo...()|).
-extern Core* g_core;
+MOJO_SYSTEM_IMPL_EXPORT extern Core* g_core;
 extern base::TaskRunner* g_delegate_thread_task_runner;
 extern ProcessDelegate* g_process_delegate;
 MOJO_SYSTEM_IMPL_EXPORT extern base::TaskRunner* g_io_thread_task_runner;
 
-// TODO(use_chrome_edk): temporary until we have only one SDK.
-MOJO_SYSTEM_IMPL_EXPORT Core* GetCore();
-
 }  // namespace internal
 
 }  // namepace edk