Replace a WTF::Function conversion operator to be a function

third_party/WebKit/Source/platform/mojo/MojoHelper.h

Index: third_party/WebKit/Source/platform/mojo/MojoHelper.h
diff --git a/third_party/WebKit/Source/platform/mojo/MojoHelper.h b/third_party/WebKit/Source/platform/mojo/MojoHelper.h
index 6493495b8a658fe9214fb3da58d2e99420de40fc..e37112ba6e6f530bac0326e49c1267f19dfffafc 100644
--- a/third_party/WebKit/Source/platform/mojo/MojoHelper.h
+++ b/third_party/WebKit/Source/platform/mojo/MojoHelper.h
@@ -5,22 +5,10 @@
 #ifndef MojoHelper_h
 #define MojoHelper_h
 
-#include "base/callback.h"
 #include "mojo/public/cpp/bindings/wtf_array.h"
 #include "platform/heap/HeapAllocator.h"
-#include "wtf/Functional.h"
 #include <utility>
 
-namespace blink {
-
-template <typename R, typename... Args>
-base::Callback<R(Args...)> createBaseCallback(std::unique_ptr<Function<R(Args...)>> functor)
-{
-    return static_cast<base::Callback<R(Args...)>>(*functor);
-}
-
-} // namespace blink
-
 namespace mojo {
 
 // A |TypeConverter| that will create a |WTFArray<T>| containing a copy of the