Fixing race condition on banner showing code.

chrome/browser/resources/file_manager/js/file_manager.js

Index: chrome/browser/resources/file_manager/js/file_manager.js
diff --git a/chrome/browser/resources/file_manager/js/file_manager.js b/chrome/browser/resources/file_manager/js/file_manager.js
index e05580d061f12540dba7bf0f098af53e51b1f8e9..c575cbe7b8a09024512266398a23eebb748db74b 100644
--- a/chrome/browser/resources/file_manager/js/file_manager.js
+++ b/chrome/browser/resources/file_manager/js/file_manager.js
@@ -3891,16 +3891,6 @@ FileManager.prototype = {
     var self = this;
 
     function showBanner(type, messageId) {
-      if (!self.dialogContainer_.hasAttribute('gdrive-welcome-style')) {
-        self.dialogContainer_.setAttribute('gdrive-welcome-style', true);
-        var style = self.document_.createElement('link');
-        style.rel = 'stylesheet';
-        style.href = 'css/gdrive_welcome.css';
-        self.document_.head.appendChild(style);
-        style.onload = function() { showBanner(type, messageId) };
-        return;
-      }
-
       self.showGDataWelcome_(type);
 
       var container = self.dialogDom_.querySelector('.gdrive-welcome.' + type);
@@ -3963,6 +3953,16 @@ FileManager.prototype = {
         return;
       }
 
+      if (!self.dialogContainer_.hasAttribute('gdrive-welcome-style')) {
+        self.dialogContainer_.setAttribute('gdrive-welcome-style', true);
+        var style = self.document_.createElement('link');
+        style.rel = 'stylesheet';
+        style.href = 'css/gdrive_welcome.css';
+        self.document_.head.appendChild(style);
+        style.onload = function() { maybeShowBanner() };
+        return;
+      }
+
       var counter = getHeaderCounter();
 
       if (self.directoryModel_.getFileList().length == 0 && counter == 0) {