Move CrossThreadCopier from platform/ to wtf/

third_party/WebKit/Source/bindings/core/v8/SourceLocation.h

Index: third_party/WebKit/Source/bindings/core/v8/SourceLocation.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/SourceLocation.h b/third_party/WebKit/Source/bindings/core/v8/SourceLocation.h
index 69b5af5b46ceb2e49ef49de2d3a03b6e7ff7f723..c64ed344dd8e6292a1eef6356dd6ef1654baf83b 100644
--- a/third_party/WebKit/Source/bindings/core/v8/SourceLocation.h
+++ b/third_party/WebKit/Source/bindings/core/v8/SourceLocation.h
@@ -6,8 +6,8 @@
 #define SourceLocation_h
 
 #include "core/CoreExport.h"
-#include "platform/CrossThreadCopier.h"
 #include "platform/v8_inspector/public/V8StackTrace.h"
+#include "wtf/CrossThreadCopier.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 #include <memory>
@@ -68,10 +68,14 @@ private:
     int m_scriptId;
 };
 
+} // namespace blink
+
+namespace WTF {
+
 template <>
-struct CrossThreadCopier<std::unique_ptr<SourceLocation>> {
-    using Type = std::unique_ptr<SourceLocation>;
-    static Type copy(std::unique_ptr<SourceLocation> location)
+struct CrossThreadCopier<std::unique_ptr<blink::SourceLocation>> {
+    using Type = std::unique_ptr<blink::SourceLocation>;
+    static Type copy(std::unique_ptr<blink::SourceLocation> location)
     {
         return location ? location->isolatedCopy() : nullptr;
     }