Revert "Address missed CL comments for chrome.enterprisePrivate.getDeviceInfo() CL."

This reverts commit 4364277e.

Reason for revert: 

The base::mac::CFCastStrict<CFNumberRef>(ask_for_password) cast returns NULL in some cases, and causes a crash.

I'll re-land the original CL (which actually fixes a memory leak), with the proper guards to avoid the crash.

Original change's description:
> Address missed CL comments for chrome.enterprisePrivate.getDeviceInfo() CL.
> 
> Original CL was at:
> https://chromium-review.googlesource.com/c/chromium/src/+/1951561
> 
> Change-Id: I8784ec61cec5834b17afe04ea8b1d474178af15e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1961211
> Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Commit-Queue: Tim Song <tengs@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#723985}

TBR=pastarmovj@chromium.org,tengs@chromium.org,rsesek@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I38286e8d12aa82faff4fc798bc81857ac3576f4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978419Reviewed-by: Gustavo Sacomoto <sacomoto@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Gustavo Sacomoto <sacomoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726886}

chrome/browser/extensions/api/enterprise_reporting_private/device_info_fetcher_mac.mm

@@ -47,14 +47,13 @@ std::string GetSerialNumber() {
 enterprise_reporting_private::SettingValue GetScreenlockSecured() {
   CFStringRef screen_saver_application = CFSTR("com.apple.screensaver");
   CFStringRef ask_for_password_key = CFSTR("askForPassword");
-
-  base::ScopedCFTypeRef<CFTypeRef> ask_for_password(CFPreferencesCopyAppValue(
-      ask_for_password_key, screen_saver_application));
+  base::ScopedCFTypeRef<CFNumberRef> ask_for_password(
+      base::mac::CFCastStrict<CFNumberRef>(CFPreferencesCopyAppValue(
+          ask_for_password_key, screen_saver_application)));
 
   int screen_lock_enabled = 0;
-  if (!ask_for_password ||
-      !CFNumberGetValue(base::mac::CFCastStrict<CFNumberRef>(ask_for_password),
-                        kCFNumberIntType, &screen_lock_enabled)) {
+  if (!ask_for_password || !CFNumberGetValue(ask_for_password, kCFNumberIntType,
+                                             &screen_lock_enabled)) {
     return enterprise_reporting_private::SETTING_VALUE_UNKNOWN;
   }