reverted:
--- b/core/modules/user/user.install
+++ a/core/modules/user/user.install
@@ -46,12 +46,6 @@
         'unsigned' => TRUE,
         'default' => 0,
       ),
-      'changed' => array(
-        'description' => 'The Unix timestamp when the user was most recently saved.',
-        'type' => 'int',
-        'not null' => TRUE,
-        'default' => 0,
-      ),
     ),
     'primary key' => array('uid', 'module', 'name'),
     'indexes' => array(
only in patch2:
unchanged:
--- a/core/modules/user/src/Tests/UserCreateTest.php
+++ b/core/modules/user/src/Tests/UserCreateTest.php
@@ -31,6 +31,9 @@ protected function testUserAdd() {
     $user = $this->drupalCreateUser(array('administer users'));
     $this->drupalLogin($user);
 
+    $this->assertEqual($user->getCreatedTime(), REQUEST_TIME, 'Creating a user sets default "created" timestamp.');
+    $this->assertEqual($user->getChangedTime(), REQUEST_TIME, 'Creating a user sets default "changed" timestamp.');
+
     // Create a field and an instance.
     $field_name = 'test_field';
     $field = array(
only in patch2:
unchanged:
--- a/core/modules/user/src/Tests/UserEditTest.php
+++ b/core/modules/user/src/Tests/UserEditTest.php
@@ -65,6 +65,9 @@ function testUserEdit() {
     $this->drupalPostForm("user/" . $user1->id() . "/edit", $edit, t('Save'));
     $this->assertRaw(t("The changes have been saved."));
 
+    // Make sure the changed timestamp is updated.
+    $this->assertEqual($user1->getChangedTime(), REQUEST_TIME, 'Changing a user sets "changed" timestamp.');
+
     // Make sure the user can log in with their new password.
     $this->drupalLogout();
     $user1->pass_raw = $new_pass;