Revert "Removed text/plain header."

This reverts commit fa6d26b5.

apps/contacts/ajax/currentphoto.php

@@ -20,6 +20,8 @@
  *
  */
 
+// Firefox and Konqueror tries to download application/json for me.  --Arthur
+OCP\JSON::setContentTypeHeader('text/plain');
 OCP\JSON::checkLoggedIn();
 OCP\JSON::checkAppEnabled('contacts');
 require_once 'loghandler.php';

apps/contacts/ajax/savecrop.php

@@ -24,6 +24,9 @@ OCP\JSON::checkLoggedIn();
 OCP\JSON::checkAppEnabled('contacts');
 OCP\JSON::callCheck();
 
+// Firefox and Konqueror tries to download application/json for me.  --Arthur
+OCP\JSON::setContentTypeHeader('text/plain');
+
 require_once 'loghandler.php';
 
 $image = null;

apps/contacts/ajax/uploadphoto.php

@@ -25,6 +25,8 @@ OCP\JSON::checkLoggedIn();
 OCP\JSON::checkAppEnabled('contacts');
 OCP\JSON::callCheck();
 
+// Firefox and Konqueror tries to download application/json for me.  --Arthur
+OCP\JSON::setContentTypeHeader('text/plain');
 require_once 'loghandler.php';
 $l10n = OC_Contacts_App::$l10n;
 // If it is a Drag'n'Drop transfer it's handled here.