Revert "QMetaType: support manual unregistration"

This reverts commit cf000d080c.

Reason for revert: This API is not needed (anymore) by qtdeclarative.

Change-Id: I8af604c2babe3afc11f183ddb3ce3a9038a456ad
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

src/corelib/kernel/qmetatype.cpp

@@ -669,13 +669,6 @@ void QtMetaTypePrivate::derefAndDestroy(QtPrivate::QMetaTypeInterface *d_ptr)
     }
 }
 
-Q_CORE_EXPORT void QtMetaTypePrivate::unsafeUnregister(QtPrivate::QMetaTypeInterface *d_ptr)
-{
-    if (auto reg = customTypeRegistry())
-        reg->unregisterDynamicType(d_ptr->typeId.loadRelaxed());
-    d_ptr->typeId = 0;
-}
-
 /*!
     \fn QMetaType::~QMetaType()
 
@@ -1775,12 +1768,6 @@ QT_FOR_EACH_STATIC_PRIMITIVE_POINTER(QT_METATYPE_DECLARE_TEMPLATE_ITER)
 QT_FOR_EACH_STATIC_CORE_CLASS(QT_METATYPE_DECLARE_TEMPLATE_ITER)
 QT_FOR_EACH_STATIC_CORE_POINTER(QT_METATYPE_DECLARE_TEMPLATE_ITER)
 QT_FOR_EACH_STATIC_CORE_TEMPLATE(QT_METATYPE_DECLARE_TEMPLATE_ITER)
-
-Q_CORE_EXPORT QMetaTypeInterface *QMetaTypeInterface::get(const QMetaType &metatype)
-{
-    return metatype.d_ptr;
-}
-
 #undef QT_METATYPE_DECLARE_TEMPLATE_ITER
 #endif
 }

src/corelib/kernel/qmetatype.h

@@ -700,7 +700,6 @@ public:
     static void unregisterConverterFunction(int from, int to);
 private:
     friend class QVariant;
-    friend class QtPrivate::QMetaTypeInterface;
     QtPrivate::QMetaTypeInterface *d_ptr = nullptr;
 };
 
@@ -2285,8 +2284,6 @@ public:
 
     using LegacyRegisterOp = void (*)();
     LegacyRegisterOp legacyRegisterOp;
-
-    Q_CORE_EXPORT static QMetaTypeInterface *get(const QMetaType &metatype);
 };
 
 struct QTypeNormalizer

src/corelib/kernel/qmetatype_p.h

@@ -218,7 +218,6 @@ static QtPrivate::QMetaTypeInterface *getInterfaceFromType()
         return true;
 
 void derefAndDestroy(QtPrivate::QMetaTypeInterface *d_ptr);
-Q_CORE_EXPORT void unsafeUnregister(QtPrivate::QMetaTypeInterface *d_ptr);
 
 } //namespace QtMetaTypePrivate