Convert "return local_var.Pass();" to "return local_var;".

services/url_response_disk_cache/url_response_disk_cache_db.cc

Index: services/url_response_disk_cache/url_response_disk_cache_db.cc
diff --git a/services/url_response_disk_cache/url_response_disk_cache_db.cc b/services/url_response_disk_cache/url_response_disk_cache_db.cc
index f7eb587a0411b890aed49108c34e4a22e01e6557..580f73bb54efa32dcbbb301457e12eeb775542f0 100644
--- a/services/url_response_disk_cache/url_response_disk_cache_db.cc
+++ b/services/url_response_disk_cache/url_response_disk_cache_db.cc
@@ -190,7 +190,7 @@ CacheEntryPtr URLResponseDiskCacheDB::Get(CacheKeyPtr key) {
   DCHECK(status.ok());
   CacheEntryPtr result;
   Deserialize(entry_string, &result);
-  return result.Pass();
+  return result;
 }
 
 void URLResponseDiskCacheDB::PutNew(const std::string& request_origin,
@@ -225,7 +225,7 @@ CacheEntryPtr URLResponseDiskCacheDB::GetNewest(
       }
     }
   }
-  return result.Pass();
+  return result;
 }
 
 void URLResponseDiskCacheDB::Delete(CacheKeyPtr key) {