Adding pref to store the user-selected proximity threshold.

components/proximity_auth/unlock_manager_impl_unittest.cc

Index: components/proximity_auth/unlock_manager_impl_unittest.cc
diff --git a/components/proximity_auth/unlock_manager_impl_unittest.cc b/components/proximity_auth/unlock_manager_impl_unittest.cc
index 9dc836f9ae92a6629637d79d54799f037f2f3910..f6b1bdc5b183ca9c30a36c553a0ab2b85ba30985 100644
--- a/components/proximity_auth/unlock_manager_impl_unittest.cc
+++ b/components/proximity_auth/unlock_manager_impl_unittest.cc
@@ -40,6 +40,8 @@ using testing::NiceMock;
 using testing::Return;
 using testing::_;
 
+class PrefService;
+
 namespace proximity_auth {
 namespace {
 
@@ -137,7 +139,8 @@ class TestUnlockManager : public UnlockManagerImpl {
 
  private:
   std::unique_ptr<ProximityMonitor> CreateProximityMonitor(
-      cryptauth::Connection* connection) override {
+      cryptauth::Connection* connection,
+      PrefService* pref_service) override {
     EXPECT_EQ(cryptauth::kTestRemoteDevicePublicKey,
               connection->remote_device().public_key);
     std::unique_ptr<MockProximityMonitor> proximity_monitor(