bug #17748 [DomCrawler] Remove the overridden getHash() method to pre…

…vent problems when cloning the crawler (jakzal)

This PR was merged into the 2.8 branch.

Discussion
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[DomCrawler] Remove the overridden getHash() method to prevent problems when cloning the crawler

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #16421
| License       | MIT
| Doc PR        | -

Overriding the `SplObjectStorage::getHash()` is affected by a [PHP bug](https://bugs.php.net/bug.php?id=67582), which makes the Crawler unusable in Symfony 2.8 for anyone who relied on `SplObjectStorage` methods.

Removing the `getHash()` method means we will no longer trigger the deprecation error. Given this method is unlikely to be used directly and other `SplObjectStorage` methods will trigger the error, it is the simplest thing we can do to maintain BC.

Commits
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3d7f6c6 [DomCrawler] Remove the overridden getHash() method to prevent problems when cloning the crawler

src/Symfony/Component/DomCrawler/Crawler.php

@@ -950,16 +950,6 @@ public function offsetGet($object)
         return parent::offsetGet($object);
     }
 
-    /**
-     * @deprecated Using the SplObjectStorage API on the Crawler is deprecated as of 2.8 and will be removed in 3.0.
-     */
-    public function getHash($object)
-    {
-        $this->triggerDeprecation(__METHOD__, true);
-
-        return parent::getHash($object);
-    }
-
     /**
      * Filters the list of nodes with an XPath expression.
      *