Rename WebCore namespace to blink in Platform

Source/platform/network/DNS.cpp

Index: Source/platform/network/DNS.cpp
diff --git a/Source/platform/network/DNS.cpp b/Source/platform/network/DNS.cpp
index 5ed8f259b27236d8ddd747575aba98d3bb0b999c..b87b916846548d81238b50173eb4118812038dd9 100644
--- a/Source/platform/network/DNS.cpp
+++ b/Source/platform/network/DNS.cpp
@@ -30,7 +30,7 @@
 #include "public/platform/Platform.h"
 #include "public/platform/WebPrescientNetworking.h"
 
-namespace WebCore {
+namespace blink {
 
 void prefetchDNS(const String& hostname)
 {
@@ -42,4 +42,4 @@ void prefetchDNS(const String& hostname)
     prescientNetworking->prefetchDNS(hostname);
 }
 
-} // namespace WebCore
+} // namespace blink