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

chrome/browser/signin/screenlock_bridge.cc

Index: chrome/browser/signin/screenlock_bridge.cc
diff --git a/chrome/browser/signin/screenlock_bridge.cc b/chrome/browser/signin/screenlock_bridge.cc
index 586ed485f5f16e698a2309f6f84f39bcde7a5d96..db80a2d9c8a16e84fd18e04ae4203a71ea96c4c8 100644
--- a/chrome/browser/signin/screenlock_bridge.cc
+++ b/chrome/browser/signin/screenlock_bridge.cc
@@ -109,10 +109,11 @@ void ScreenlockBridge::UserPodCustomIconOptions::SetHardlockOnClick() {
 }
 
 // static
-std::string ScreenlockBridge::GetAuthenticatedUserEmail(Profile* profile) {
+std::string ScreenlockBridge::GetAuthenticatedUserEmail(
+    const Profile* profile) {
   // |profile| has to be a signed-in profile with SigninManager already
   // created. Otherwise, just crash to collect stack.
-  SigninManagerBase* signin_manager =
+  const SigninManagerBase* signin_manager =
       SigninManagerFactory::GetForProfileIfExists(profile);
   return signin_manager->GetAuthenticatedUsername();
 }