Enable RL sync by default on iOS

chrome/browser/sync/chrome_sync_client.cc

Index: chrome/browser/sync/chrome_sync_client.cc
diff --git a/chrome/browser/sync/chrome_sync_client.cc b/chrome/browser/sync/chrome_sync_client.cc
index 05a808c5e13aac51ad1711391b0d82bd45388c80..48b95d594eda1eb77bc23455cd00432ecc2f782e 100644
--- a/chrome/browser/sync/chrome_sync_client.cc
+++ b/chrome/browser/sync/chrome_sync_client.cc
@@ -436,6 +436,9 @@ ChromeSyncClient::GetSyncBridgeForModelType(syncer::ModelType type) {
       return ProfileSyncServiceFactory::GetForProfile(profile_)
           ->GetDeviceInfoSyncBridge()
           ->AsWeakPtr();
+    case syncer::READING_LIST:

[pavely, 2016/11/20 02:31:58]

You can add NOTREACHED() as well as this function shouldn't be called on iOS.

[Olivier, 2016/11/20 10:32:33]

Done.

+      // Reading List is only supported on iOS at the moment.
+      return base::WeakPtr<syncer::ModelTypeSyncBridge>();
     default:
       NOTREACHED();
       return base::WeakPtr<syncer::ModelTypeSyncBridge>();