LibCore: Move Stream-based file into the Core namespace

Author: https://github.com/timschumi
Commit: 606a3982f3
Pull-request: https://github.com/SerenityOS/serenity/pull/17406
Reviewed-by: https://github.com/linusg

Userland/Utilities/cpp-parser.cpp

@@ -5,6 +5,7 @@
  */
 
 #include <LibCore/ArgsParser.h>
+#include <LibCore/File.h>
 #include <LibCore/Stream.h>
 #include <LibCpp/Parser.h>
 #include <LibMain/Main.h>
@@ -20,7 +21,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     if (path.is_empty())
         path = "Source/little/main.cpp"sv;
-    auto file = TRY(Core::Stream::File::open(path, Core::Stream::OpenMode::Read));
+    auto file = TRY(Core::File::open(path, Core::File::OpenMode::Read));
     auto content = TRY(file->read_until_eof());
     StringView content_view(content);