Make JavaScript dialogs auto-dismiss on tab switch.

components/app_modal/javascript_dialog_manager.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/app_modal/javascript_dialog_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 132 matching lines @@
 
   // Also log the time since a dialog was closed, but only if this is the first
   // dialog that was opened since the closing.
   if (!last_close_time_.is_null()) {
     UMA_HISTOGRAM_MEDIUM_TIMES(
         "JSDialogs.FineTiming.TimeBetweenDialogClosedAndNextDialogCreated",
         now - last_close_time_);
     last_close_time_ = base::TimeTicks();
   }
 
-  bool is_alert = message_type == content::JAVASCRIPT_MESSAGE_TYPE_ALERT;
-  base::string16 dialog_title = GetTitle(web_contents, origin_url, is_alert);
+  base::string16 dialog_title = GetTitle(web_contents, origin_url);
 
   extensions_client_->OnDialogOpened(web_contents);
 
   LogUMAMessageLengthStats(message_text);
   AppModalDialogQueue::GetInstance()->AddDialog(new JavaScriptAppModalDialog(
       web_contents,
       &javascript_dialog_extra_data_,
       dialog_title,
       message_type,
       message_text,
@@ skipping 71 matching lines @@
       dialog->SetOverridePromptText(*prompt_override);
     dialog->native_dialog()->AcceptAppModalDialog();
   } else {
     dialog->native_dialog()->CancelAppModalDialog();
   }
   return true;
 }
 
 base::string16 JavaScriptDialogManager::GetTitle(
     content::WebContents* web_contents,
-    const GURL& origin_url,
-    bool is_alert) {
+    const GURL& origin_url) {
   // For extensions, show the extension name, but only if the origin of
   // the alert matches the top-level WebContents.
   std::string name;
   if (extensions_client_->GetExtensionName(web_contents, origin_url, &name))
     return base::UTF8ToUTF16(name);
 
   // Otherwise, return the formatted URL. For non-standard URLs such as |data:|,
   // just say "This page".
   bool is_same_origin_as_main_frame =
       (web_contents->GetURL().GetOrigin() == origin_url.GetOrigin());
@@ skipping 65 matching lines @@
   // lazy background page after the dialog closes. (Dialogs are closed before
   // their WebContents is destroyed so |web_contents| is still valid here.)
   extensions_client_->OnDialogClosed(web_contents);
 
   last_close_time_ = base::TimeTicks::Now();
 
   callback.Run(success, user_input);
 }
 
 }  // namespace app_modal