MAGETWO-66608: Cover OfflineShipping module with @api annotation

 - removed unused code

Author: Volodymyr Kublytskyi

app/code/Magento/OfflineShipping/Model/Carrier/Pickup.php

@@ -63,30 +63,8 @@ public function __construct(
      */
     public function collectRates(RateRequest $request)
     {
-        if (!$this->getConfigFlag('active')) {
-            return false;
-        }
-
-        /** @var \Magento\Shipping\Model\Rate\Result $result */
-        $result = $this->_rateResultFactory->create();
-
-        if (!empty($rate)) {
-            /** @var \Magento\Quote\Model\Quote\Address\RateResult\Method $method */
-            $method = $this->_rateMethodFactory->create();
-
-            $method->setCarrier('pickup');
-            $method->setCarrierTitle($this->getConfigData('title'));
-
-            $method->setMethod('store');
-            $method->setMethodTitle(__('Store Pickup'));
-
-            $method->setPrice(0);
-            $method->setCost(0);
-
-            $result->append($method);
-        }
-
-        return $result;
+        // Pickup shipping method is not supported in Magento2 yet.
+        return false;
     }
 
     /**