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The benefit of all covenants and powers given by way of indemnity against a rent or any part thereof payable in respect of land, or against the breach of any covenant or condition in relation to land, is and shall be deemed always to have been annexed to the land to which the indemnity is intended to relate, and may be enforced by the estate owner for the time being of the whole or any part of that land, notwithstanding that the benefit may not have been expressly apportioned or assigned to him or to any of his predecessors in title.