Minor cleanup: IWYU, clang-tidy, etc.

PiperOrigin-RevId: 613349591

src/google/protobuf/message.cc

@@ -15,8 +15,9 @@
 #include <cstddef>
 #include <cstdint>
 #include <cstring>
-#include <new>
+#include <new>  // IWYU pragma: keep for operator new().
 #include <string>
+#include <vector>
 
 #include "absl/base/call_once.h"
 #include "absl/base/optimization.h"
@@ -44,7 +45,6 @@
 #include "google/protobuf/reflection_ops.h"
 #include "google/protobuf/unknown_field_set.h"
 #include "google/protobuf/wire_format.h"
-#include "google/protobuf/wire_format_lite.h"
 
 
 // Must be included last.
@@ -64,7 +64,6 @@ void RegisterFileLevelMetadata(const DescriptorTable* descriptor_table);
 using internal::DownCast;
 using internal::ReflectionOps;
 using internal::WireFormat;
-using internal::WireFormatLite;
 
 void Message::MergeImpl(MessageLite& to, const MessageLite& from) {
   ReflectionOps::Merge(DownCast<const Message&>(from), DownCast<Message*>(&to));