How to remove "FILE NAME SUGGESTION" from rendered HTML I'm using D7.

I want to remove "FILE NAME SUGGESTION"(please refer to the uploaded image) from pages.

Honestly, I have no idea why it is displayed nor when it was enabled...

So, I searched the ways to enable that IN ORDER TO DISABLE NOW.
I found there are three possible ways to enable it (Sorry if those ways are wrong because of my mis-understanding English):


Make $conf['theme_debug'] = TRUE; in settings.php
Implement function like

function mytheme_preprocess_page(&amp;$vars, $hook) {
  if (isset($vars['node']-&gt;type)) {
    $vars['theme_hook_suggestions'][] = 'page__' . $vars['node']-&gt;type;
  }
}

Use Theme developer module


About 1, I checked settings.php and found $conf['theme_debug'] = TRUE; comment out in that.

About 2, I checked my template.php and found I coded the function mytheme_preprocess_page(&amp;$vars, $hook) {...}. So, I removed it.

About 3, I installed Theme developer module but it made all pages blank white pages. So I manually updated the module's status from 1 to 0 of the module on system table on the database, and uninstalled.

So, now I don't know why it still output "FILE NAME SUGGESTION". Does anybody have any idea why?
I found the reason why "FILE NAME SUGGESTION" was still output.
It is because a following code still remained in template.php in Zen(not sub theme).

$GLOBALS['conf']['theme_debug'] = TRUE;


I didn't coded it by myself. So, I guess the code was added when I install some module(probably Theme developer?).

Anyways, when I comment out it,  "FILE NAME SUGGESTION" disappered.