Introduce blink::ServiceProvider

sky/engine/platform/exported/ServiceProvider.cpp

Index: sky/engine/platform/exported/ServiceProvider.cpp
diff --git a/sky/engine/core/css/Pair.cpp b/sky/engine/platform/exported/ServiceProvider.cpp
similarity index 62%
copy from sky/engine/core/css/Pair.cpp
copy to sky/engine/platform/exported/ServiceProvider.cpp
index cadd14829094e65058da3714310303cb87b3186e..1e92b102302bf087bb0623ad8cafcf65e3de481c 100644
--- a/sky/engine/core/css/Pair.cpp
+++ b/sky/engine/platform/exported/ServiceProvider.cpp
@@ -3,14 +3,11 @@
 // found in the LICENSE file.
 
 #include "config.h"
-#include "core/css/Pair.h"
+#include "public/platform/ServiceProvider.h"
 
 namespace blink {
 
-void Pair::trace(Visitor* visitor)
-{
-    visitor->trace(m_first);
-    visitor->trace(m_second);
+ServiceProvider::~ServiceProvider() {
 }
 
-}
+} // namespace blink