Cleanup namespace usage in Source/core/platform/[A-Z]*.h

Source/platform/Supplementable.h

Index: Source/platform/Supplementable.h
diff --git a/Source/platform/Supplementable.h b/Source/platform/Supplementable.h
index 650a204bd57cbbee12b7ebf1ad25f73e6e3b5791..7229740b1d60a14697fefaab2305fdc4bf1eb0b2 100644
--- a/Source/platform/Supplementable.h
+++ b/Source/platform/Supplementable.h
@@ -284,12 +284,12 @@ public:
 };
 
 template<typename T>
-struct ThreadingTrait<blink::SupplementBase<T, true> > {
+struct ThreadingTrait<SupplementBase<T, true> > {
     static const ThreadAffinity Affinity = ThreadingTrait<T>::Affinity;
 };
 
 template<typename T>
-struct ThreadingTrait<blink::SupplementableBase<T, true> > {
+struct ThreadingTrait<SupplementableBase<T, true> > {
     static const ThreadAffinity Affinity = ThreadingTrait<T>::Affinity;
 };