Reduce usage of FOR_EACH_OBSERVER macro in components/

components/proximity_auth/cryptauth/mock_cryptauth_client.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/proximity_auth/cryptauth/mock_cryptauth_client.h"
 
 #include <utility>
 
 #include "base/callback.h"
 
@@ skipping 12 matching lines @@
 MockCryptAuthClientFactory::~MockCryptAuthClientFactory() {
 }
 
 std::unique_ptr<CryptAuthClient> MockCryptAuthClientFactory::CreateInstance() {
   std::unique_ptr<MockCryptAuthClient> client;
   if (mock_type_ == MockType::MAKE_STRICT_MOCKS)
     client.reset(new testing::StrictMock<MockCryptAuthClient>());
   else
     client.reset(new testing::NiceMock<MockCryptAuthClient>());
 
-  FOR_EACH_OBSERVER(Observer, observer_list_,
-                    OnCryptAuthClientCreated(client.get()));
+  for (auto& observer : observer_list_)
+    observer.OnCryptAuthClientCreated(client.get());
   return std::move(client);
 }
 
 void MockCryptAuthClientFactory::AddObserver(Observer* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void MockCryptAuthClientFactory::RemoveObserver(Observer* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
 }  // namespace proximity_auth