Make JavaScript dialogs auto-dismiss on tab switch.

chrome/browser/ui/tab_helpers.cc

Index: chrome/browser/ui/tab_helpers.cc
diff --git a/chrome/browser/ui/tab_helpers.cc b/chrome/browser/ui/tab_helpers.cc
index eb089c58ea04aa49fb0c5f55ffe555181295a4ab..76244e78a954a74e661923f64f10eeb95de65a9f 100644
--- a/chrome/browser/ui/tab_helpers.cc
+++ b/chrome/browser/ui/tab_helpers.cc
@@ -38,7 +38,6 @@
 #include "chrome/browser/ui/autofill/chrome_autofill_client.h"
 #include "chrome/browser/ui/blocked_content/popup_blocker_tab_helper.h"
 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
-#include "chrome/browser/ui/javascript_dialogs/javascript_dialog_tab_helper.h"
 #include "chrome/browser/ui/navigation_correction_tab_observer.h"
 #include "chrome/browser/ui/passwords/manage_passwords_ui_controller.h"
 #include "chrome/browser/ui/pdf/chrome_pdf_web_contents_helper_client.h"
@@ -79,6 +78,7 @@
 #include "chrome/browser/thumbnails/thumbnail_tab_helper.h"
 #include "chrome/browser/ui/bookmarks/bookmark_tab_helper.h"
 #include "chrome/browser/ui/hung_plugin_tab_helper.h"
+#include "chrome/browser/ui/javascript_dialogs/javascript_dialog_tab_helper.h"
 #include "chrome/browser/ui/sad_tab_helper.h"
 #include "chrome/browser/ui/sync/tab_contents_synced_tab_delegate.h"
 #include "components/pdf/browser/pdf_web_contents_helper.h"
@@ -173,7 +173,6 @@ void TabHelpers::AttachTabHelpers(WebContents* web_contents) {
                             web_contents->GetBrowserContext())).get());
   HistoryTabHelper::CreateForWebContents(web_contents);
   InfoBarService::CreateForWebContents(web_contents);
-  JavaScriptDialogTabHelper::CreateForWebContents(web_contents);
   NavigationCorrectionTabObserver::CreateForWebContents(web_contents);
   NavigationMetricsRecorder::CreateForWebContents(web_contents);
   chrome::InitializePageLoadMetricsForWebContents(web_contents);
@@ -216,6 +215,7 @@ void TabHelpers::AttachTabHelpers(WebContents* web_contents) {
       web_contents);
   extensions::WebNavigationTabObserver::CreateForWebContents(web_contents);
   HungPluginTabHelper::CreateForWebContents(web_contents);
+  JavaScriptDialogTabHelper::CreateForWebContents(web_contents);
   ManagePasswordsUIController::CreateForWebContents(web_contents);
   pdf::PDFWebContentsHelper::CreateForWebContentsWithClient(
       web_contents, std::unique_ptr<pdf::PDFWebContentsHelperClient>(