minor #18348 [Process] remove dead code (nicolas-grekas)

This PR was merged into the 2.3 branch.

Discussion
----------

[Process] remove dead code

| Q             | A
| ------------- | ---
| Branch?       | 2.3
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

d5e8f6f [Process] remove dead code

Author: fabpot

src/Symfony/Component/Process/Tests/ProcessTest.php

@@ -901,23 +901,6 @@ public function pipesCodeProvider()
         return $codes;
     }
 
-    /**
-     * provides default method names for simple getter/setter.
-     */
-    public function methodProvider()
-    {
-        $defaults = array(
-            array('CommandLine'),
-            array('Timeout'),
-            array('WorkingDirectory'),
-            array('Env'),
-            array('Stdin'),
-            array('Options'),
-        );
-
-        return $defaults;
-    }
-
     /**
      * @param string $commandline
      * @param null   $cwd