Change chromeos:: to ash:: for ProfileHelper

ProfileHelper was moved to ash in https://crrev.com/c/2658784. However,
there are lots of chromeos::ProfileHelper in codes because of temporary
'using' declaration of ProfileHelper. So, this CL changes chromeos:: to
ash:: for ProfileHelper at codes which will eventually specifies with
the identifier 'ash::' or removes 'chromeos::' if it already inside
namespace ash.

This CL is part of the Chrome OS source code directory migration:
https://docs.google.com/document/d/1g-98HpzA8XcoGBWUv1gQNr4rbnD5yfvbtYZyPDDbkaE.

Change-Id: I90ccf954d75f9752c8d9e5d12edb27ac2f3cb30d
Bug: 1164001
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3372082
Reviewed-by: Hidehiko Abe <[email protected]>
Owners-Override: Hidehiko Abe <[email protected]>
Commit-Queue: Yeunjoo Choi <[email protected]>
Cr-Commit-Position: refs/heads/main@{#958418}
diff --git a/chrome/browser/sharesheet/sharesheet_service_factory.cc b/chrome/browser/sharesheet/sharesheet_service_factory.cc
index 7b679a6a..7692876 100644
--- a/chrome/browser/sharesheet/sharesheet_service_factory.cc
+++ b/chrome/browser/sharesheet/sharesheet_service_factory.cc
@@ -53,7 +53,7 @@
   }
 
 #if BUILDFLAG(IS_CHROMEOS_ASH)
-  if (chromeos::ProfileHelper::IsSigninProfile(profile)) {
+  if (ash::ProfileHelper::IsSigninProfile(profile)) {
     return nullptr;
   }