[Cleanup] Const-correct the profile() method for the EasyUnlockService

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index 3febac0b306aed89bd1092688ac79f1db6b36bc1..df45c6d210a090ce4074a574fe3516bab21b4d21 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -939,6 +939,11 @@ Profile::ExitType ProfileImpl::GetLastSessionExitType() {
 }
 
 PrefService* ProfileImpl::GetPrefs() {
+  return const_cast<PrefService*>(
+      static_cast<const ProfileImpl*>(this)->GetPrefs());
+}
+
+const PrefService* ProfileImpl::GetPrefs() const {
   DCHECK(prefs_);  // Should explicitly be initialized.
   return prefs_.get();
 }