Files.app: Fix flakiness of OpenFileDialog tests.

ui/file_manager/file_manager/common/js/error_util.js

Index: ui/file_manager/file_manager/common/js/error_util.js
diff --git a/ui/file_manager/file_manager/common/js/error_util.js b/ui/file_manager/file_manager/common/js/error_util.js
index 9fd8f118d75361ef974928b4ae88950aafe1875f..4399f1604a2883f6a2202be824939e88f8fbc7d8 100644
--- a/ui/file_manager/file_manager/common/js/error_util.js
+++ b/ui/file_manager/file_manager/common/js/error_util.js
@@ -11,7 +11,13 @@ window.JSErrorCount = 0;
 /**
  * Count uncaught exceptions.
  */
-window.onerror = function() { window.JSErrorCount++; };
+window.onerror = function(message, url) {
+  // Analytics raises errors if the tracker instance is initiated in guest mode.
+  // crbug.com/459983
+  if (url === 'chrome://resources/js/analytics.js')
+    return;
+  window.JSErrorCount++;
+};
 
 // Overrides console.error() to count errors.
 /**