Revert of GetAccountIdFromProfile() should not return an empty account id if a valid profile is provided.

chrome/browser/chromeos/profiles/profile_helper.h

Index: chrome/browser/chromeos/profiles/profile_helper.h
diff --git a/chrome/browser/chromeos/profiles/profile_helper.h b/chrome/browser/chromeos/profiles/profile_helper.h
index 12a149c382dab4719fb51fe50aa730c448250c5e..2bd8072d177694e7f3f281d24ef8711c9302248d 100644
--- a/chrome/browser/chromeos/profiles/profile_helper.h
+++ b/chrome/browser/chromeos/profiles/profile_helper.h
@@ -32,10 +32,6 @@
 class MultiUserWindowManagerChromeOSTest;
 }  // namespace test
 }  // namespace ash
-
-namespace test {
-class BrowserFinderChromeOSTest;
-}  // namespace test
 
 namespace chromeos {
 
@@ -159,7 +155,6 @@
   friend class SessionStateDelegateChromeOSTest;
   friend class SystemTrayDelegateChromeOSTest;
   friend class ash::test::MultiUserWindowManagerChromeOSTest;
-  friend class ::test::BrowserFinderChromeOSTest;
 
   // Called when signin profile is cleared.
   void OnSigninProfileCleared();