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

chrome/browser/extensions/api/screenlock_private/screenlock_private_api.cc

Index: chrome/browser/extensions/api/screenlock_private/screenlock_private_api.cc
diff --git a/chrome/browser/extensions/api/screenlock_private/screenlock_private_api.cc b/chrome/browser/extensions/api/screenlock_private/screenlock_private_api.cc
index b55a9cb74b11df28ad9d26eafc3856ea233e16cf..870fd9aec86fd3a3e831267e0f24b9578e06f6cb 100644
--- a/chrome/browser/extensions/api/screenlock_private/screenlock_private_api.cc
+++ b/chrome/browser/extensions/api/screenlock_private/screenlock_private_api.cc
@@ -7,6 +7,8 @@
 #include "base/lazy_instance.h"
 #include "base/values.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/signin/chrome_proximity_auth_client.h"
+#include "chrome/browser/signin/chrome_proximity_auth_client_factory.h"
 #include "chrome/browser/signin/easy_unlock_service.h"
 #include "chrome/browser/signin/proximity_auth_facade.h"
 #include "chrome/common/extensions/api/screenlock_private.h"
@@ -65,6 +67,8 @@ bool ScreenlockPrivateSetLockedFunction::RunAsync() {
   scoped_ptr<screenlock::SetLocked::Params> params(
       screenlock::SetLocked::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
+  ChromeProximityAuthClient* proximity_auth_client =
+      ChromeProximityAuthClientFactory::GetForProfile(GetProfile());
   if (params->locked) {
     if (extension()->id() == extension_misc::kEasyUnlockAppId &&
         AppWindowRegistry::Get(browser_context())
@@ -77,9 +81,9 @@ bool ScreenlockPrivateSetLockedFunction::RunAsync() {
       if (service)
         service->SetTrialRun();
     }
-    GetScreenlockBridgeInstance()->Lock(GetProfile());
+    GetScreenlockBridgeInstance()->Lock(proximity_auth_client);
   } else {
-    GetScreenlockBridgeInstance()->Unlock(GetProfile());
+    GetScreenlockBridgeInstance()->Unlock(proximity_auth_client);
   }
   SendResponse(error_.empty());
   return true;