Convert //components/proximity_auth from scoped_ptr to std::unique_ptr

components/proximity_auth/mock_proximity_auth_client.h

Index: components/proximity_auth/mock_proximity_auth_client.h
diff --git a/components/proximity_auth/mock_proximity_auth_client.h b/components/proximity_auth/mock_proximity_auth_client.h
index 3c164f67af786f06283c7c244dce1175ca805f9a..f55f5763277b1d6a11760ec3977ef0a708a267ef 100644
--- a/components/proximity_auth/mock_proximity_auth_client.h
+++ b/components/proximity_auth/mock_proximity_auth_client.h
@@ -42,8 +42,9 @@ class MockProximityAuthClient : public ProximityAuthClient {
   MOCK_METHOD0(GetCryptAuthEnrollmentManager,
                CryptAuthEnrollmentManager*(void));
   MOCK_METHOD0(GetCryptAuthDeviceManager, CryptAuthDeviceManager*(void));
-  scoped_ptr<SecureMessageDelegate> CreateSecureMessageDelegate() override;
-  scoped_ptr<CryptAuthClientFactory> CreateCryptAuthClientFactory() override;
+  std::unique_ptr<SecureMessageDelegate> CreateSecureMessageDelegate() override;
+  std::unique_ptr<CryptAuthClientFactory> CreateCryptAuthClientFactory()
+      override;
 
   // Proxy mock methods because implementation requires returning scoped_ptr.
   MOCK_METHOD0(CreateSecureMessageDelegatePtr, SecureMessageDelegate*(void));