minor symfony#17570 Change few occurences of a public setUp() method to protected (dunglas)

This PR was merged into the 3.1-dev branch.

Discussion
----------

Change few occurences of a public setUp() method to protected

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

A new rule for fabbot.io 😊?

Commits
-------

31696b7 Change few occurences of a public setUp() method to protected

Author: fabpot

src/Symfony/Component/PropertyInfo/Tests/AbstractPropertyInfoExtractorTest.php

@@ -26,7 +26,7 @@ class AbstractPropertyInfoExtractorTest extends \PHPUnit_Framework_TestCase
      */
     protected $propertyInfo;
 
-    public function setUp()
+    protected function setUp()
     {
         $extractors = array(new NullExtractor(), new DummyExtractor());
         $this->propertyInfo = new PropertyInfoExtractor($extractors, $extractors, $extractors, $extractors);

src/Symfony/Component/PropertyInfo/Tests/PropertyInfoCacheExtractorTest.php

@@ -19,7 +19,7 @@
  */
 class PropertyInfoCacheExtractorTest extends AbstractPropertyInfoExtractorTest
 {
-    public function setUp()
+    protected function setUp()
     {
         parent::setUp();
 

src/Symfony/Component/Serializer/Tests/Normalizer/DataUriNormalizerTest.php

@@ -28,7 +28,7 @@ class DataUriNormalizerTest extends \PHPUnit_Framework_TestCase
      */
     private $normalizer;
 
-    public function setUp()
+    protected function setUp()
     {
         $this->normalizer = new DataUriNormalizer();
     }

src/Symfony/Component/Serializer/Tests/Normalizer/DateTimeNormalizerTest.php

@@ -23,7 +23,7 @@ class DateTimeNormalizerTest extends \PHPUnit_Framework_TestCase
      */
     private $normalizer;
 
-    public function setUp()
+    protected function setUp()
     {
         $this->normalizer = new DateTimeNormalizer();
     }