[SafeBrowsing] Update comment on ChromePasswordProtectionService::...

... GetAccountPasswordStore()

Bug: 1119286
Change-Id: I4b81e4d32c61c6487f0787a3d6e4821c9282bef8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416379
Auto-Submit: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Bettina Dea <bdea@chromium.org>
Reviewed-by: Bettina Dea <bdea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808120}

chrome/browser/safe_browsing/chrome_password_protection_service.h

@@ -246,9 +246,9 @@ class ChromePasswordProtectionService : public PasswordProtectionService {
   // Returns the profile PasswordStore associated with this instance.
   password_manager::PasswordStore* GetProfilePasswordStore() const;
 
-  // Returns the account PasswordStore associated with this instance. The
-  // account password store contains passwords stored in the account and is
-  // accessible only when the user is signed in.
+  // Returns the GAIA-account-scoped PasswordStore associated with this
+  // instance. The account password store contains passwords stored in the
+  // account and is accessible only when the user is signed in and non syncing.
   password_manager::PasswordStore* GetAccountPasswordStore() const;
 
   // Gets the type of sync account associated with current profile or