[GCM] Cleanup for ios enabling

chrome/browser/invalidation/ticl_invalidation_service.cc

 // Copyright (c) 2013 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 "chrome/browser/invalidation/ticl_invalidation_service.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/invalidation/gcm_invalidation_bridge.h"
@@ skipping 410 matching lines @@
   UpdateInvalidatorCredentials();
 
   invalidator_->RegisterHandler(this);
   invalidator_->UpdateRegisteredIds(
       this,
       invalidator_registrar_->GetAllRegisteredIds());
 }
 
 void TiclInvalidationService::UpdateInvalidationNetworkChannel() {
   InvalidationNetworkChannel network_channel_type = PUSH_CLIENT_CHANNEL;
-// For now don't use GCM on iOS.
-#if !defined(OS_IOS)
   if (profile_->GetPrefs()->GetBoolean(
           prefs::kInvalidationServiceUseGCMChannel) &&
       gcm::GCMProfileService::GetGCMEnabledState(profile_) ==
           gcm::GCMProfileService::ALWAYS_ENABLED) {
     network_channel_type = GCM_NETWORK_CHANNEL;
   }
-#endif
   if (network_channel_type_ == network_channel_type)
     return;
   network_channel_type_ = network_channel_type;
   if (IsStarted()) {
     StopInvalidator();
     StartInvalidator(network_channel_type_);
   }
 }
 
 void TiclInvalidationService::UpdateInvalidatorCredentials() {
   std::string email = auth_provider_->GetAccountId();
 
   DCHECK(!email.empty()) << "Expected user to be signed in.";
 
   DVLOG(2) << "UpdateCredentials: " << email;
   invalidator_->UpdateCredentials(email, access_token_);
 }
 
 void TiclInvalidationService::StopInvalidator() {
   DCHECK(invalidator_);
   gcm_invalidation_bridge_.reset();
   invalidator_->UnregisterHandler(this);
   invalidator_.reset();
 }
 
 }  // namespace invalidation