MAGETWO-36376: Magento\Quote\Api\GuestCartItemRepository

 - removed delete methods from interface and implementation

app/code/Magento/Quote/Api/GuestCartItemRepositoryInterface.php

@@ -30,15 +30,6 @@ interface GuestCartItemRepositoryInterface
      */
     public function save(\Magento\Quote\Api\Data\CartItemInterface $cartItem);
 
-    /**
-     * Delete cart item
-     *
-     * @param \Magento\Quote\Api\Data\CartItemInterface $cartItem
-     * @return void
-     * @throws \Magento\Framework\Exception\CouldNotSaveException
-     */
-    public function delete(\Magento\Quote\Api\Data\CartItemInterface $cartItem);
-
     /**
      * Removes the specified item from the specified cart.
      *

app/code/Magento/Quote/Model/GuestCart/GuestCartItemRepository.php

@@ -75,15 +75,4 @@ class GuestCartItemRepository implements \Magento\Quote\Api\GuestCartItemReposit
         $quoteIdMask = $this->quoteIdMaskFactory->create()->load($cartId, 'masked_id');
         return $this->repository->deleteById($quoteIdMask->getId(), $itemId);
     }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function delete(\Magento\Quote\Api\Data\CartItemInterface $cartItem)
-    {
-        /** @var $quoteIdMask QuoteIdMask */
-        $quoteIdMask = $this->quoteIdMaskFactory->create()->load($cartItem->getQuoteId(), 'masked_id');
-        $cartItem->setQuoteId($quoteIdMask->getId());
-        return $this->repository->delete($cartItem);
-    }
 }