[Proximity Auth] Create one ProximityAuthClient per profile, rather than one global one.

chrome/browser/signin/easy_unlock_service.cc

Index: chrome/browser/signin/easy_unlock_service.cc
diff --git a/chrome/browser/signin/easy_unlock_service.cc b/chrome/browser/signin/easy_unlock_service.cc
index 37a3ed0ffe9b8beb2ee5d6d72dbecde8e51d9303..43e652be343846f6207043e9a7ac16cbcf2a39b1 100644
--- a/chrome/browser/signin/easy_unlock_service.cc
+++ b/chrome/browser/signin/easy_unlock_service.cc
@@ -260,6 +260,7 @@ class EasyUnlockService::PowerMonitor
 
 EasyUnlockService::EasyUnlockService(Profile* profile)
     : profile_(profile),
+      proximity_auth_client_(profile),
       bluetooth_detector_(new BluetoothDetector(this)),
       shut_down_(false),
       tpm_key_checked_(false),
@@ -694,7 +695,7 @@ void EasyUnlockService::UpdateAppState() {
         !proximity_auth_ble_system_) {
       proximity_auth_ble_system_.reset(
           new proximity_auth::ProximityAuthBleSystem(
-              GetScreenlockBridgeInstance(), profile_,
+              GetScreenlockBridgeInstance(), &proximity_auth_client_,
               CreateCryptAuthClientFactory()));
     }