Don't report errors on file transfer events, because most files aren't ones we are interested in.

ui/file_manager/file_manager/background/js/import_history.js

Index: ui/file_manager/file_manager/background/js/import_history.js
diff --git a/ui/file_manager/file_manager/background/js/import_history.js b/ui/file_manager/file_manager/background/js/import_history.js
index e69ce262ae4ecd9e01e448bba914642a6b42e841..cb22333ef8706f10c6faca9d775cab556f964532 100644
--- a/ui/file_manager/file_manager/background/js/import_history.js
+++ b/ui/file_manager/file_manager/background/js/import_history.js
@@ -967,12 +967,10 @@ importer.DriveSyncWatcher.prototype.updateSyncStatus_ =
  */
 importer.DriveSyncWatcher.prototype.onFileTransfersUpdated_ =
     function(status) {
-  // TODO(smckay): What if the file isn't one we're interested in....?
-  // I guess we just let the call to markImportedByUrl fail for now.
+  // If the synced file it isn't one we copied,
+  // the call to mark by url will just fail...fine by us.
   if (status.transferState === 'completed') {
-    this.history_.markImportedByUrl(status.fileUrl)
-        .catch(
-            importer.getLogger().catcher('file-transfer-mark-imported-by-url'));
+    this.history_.markImportedByUrl(status.fileUrl);
   }
 };