Fix chatlog application query integration

Summary: `class_exists()` is case-insensitive, but `PhabricatorApplication::getByClass()` is not.

Test Plan: Fixed unit test to fail, then fixed code to pass unit test.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7379

src/applications/chatlog/PhabricatorChatLogChannelQuery.php

@@ -57,7 +57,7 @@ final class PhabricatorChatLogChannelQuery
   }
 
   public function getQueryApplicationClass() {
-    return 'PhabricatorApplicationChatlog';
+    return 'PhabricatorApplicationChatLog';
   }
 
 }

src/applications/chatlog/PhabricatorChatLogQuery.php

@@ -56,7 +56,7 @@ final class PhabricatorChatLogQuery
   }
 
   public function getQueryApplicationClass() {
-    return 'PhabricatorApplicationChatlog';
+    return 'PhabricatorApplicationChatLog';
   }
 
 }

src/applications/policy/__tests__/PhabricatorPolicyTestCase.php

@@ -222,7 +222,7 @@ final class PhabricatorPolicyTestCase extends PhabricatorTestCase {
       }
       $this->assertEqual(
         true,
-        class_exists($class),
+        (bool)PhabricatorApplication::getByClass($class),
         "Application class '{$class}' for query '{$qclass}'");
     }
   }