[Sync] Move //components/sync to the syncer namespace.

components/sync/core_impl/attachments/on_disk_attachment_store.cc

Index: components/sync/core_impl/attachments/on_disk_attachment_store.cc
diff --git a/components/sync/core_impl/attachments/on_disk_attachment_store.cc b/components/sync/core_impl/attachments/on_disk_attachment_store.cc
index 90a3af33fe9d82c2f284b7225c2dddf14cdb560d..5294638bb53465a70e1823eca5efeaaca2b74b27 100644
--- a/components/sync/core_impl/attachments/on_disk_attachment_store.cc
+++ b/components/sync/core_impl/attachments/on_disk_attachment_store.cc
@@ -42,10 +42,10 @@ const int32_t kCurrentSchemaVersion = 1;
 const base::FilePath::CharType kLeveldbDirectory[] =
     FILE_PATH_LITERAL("leveldb");
 
-// Converts syncer::AttachmentStore::Component values into
+// Converts AttachmentStore::Component values into
 // attachment_store_pb::RecordMetadata::Component.
 attachment_store_pb::RecordMetadata::Component ComponentToProto(
-    syncer::AttachmentStore::Component component) {
+    AttachmentStore::Component component) {
   switch (component) {
     case AttachmentStore::MODEL_TYPE:
       return attachment_store_pb::RecordMetadata::MODEL_TYPE;