Change eventTime field to standard chrome.* API format.

chrome/browser/extensions/api/notification/notification_api.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/api/notification/notification_api.h"
 
 #include "base/callback.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 134 matching lines @@
   string16 title(UTF8ToUTF16(options->title));
   string16 message(UTF8ToUTF16(options->message));
 
   scoped_ptr<DictionaryValue> optional_fields(new DictionaryValue());
 
   // For all notification types.
   if (options->priority.get())
     optional_fields->SetInteger(ui::notifications::kPriorityKey,
                                 *options->priority);
   if (options->event_time.get())
-    optional_fields->SetString(ui::notifications::kTimestampKey,
+    optional_fields->SetDouble(ui::notifications::kTimestampKey,
                                *options->event_time);
   if (options->buttons.get()) {
     if (options->buttons->size() > 0) {
       linked_ptr<api::experimental_notification::NotificationButton> button =
           (*options->buttons)[0];
       optional_fields->SetString(ui::notifications::kButtonOneTitleKey,
                                  UTF8ToUTF16(button->title));
       if (button->icon_url.get())
         optional_fields->SetString(ui::notifications::kButtonOneIconUrlKey,
                                    UTF8ToUTF16(*button->icon_url));
@@ skipping 139 matching lines @@
       CancelById(NotificationApiDelegate::CreateScopedIdentifier(
           extension_->id(), params_->notification_id));
 
   SetResult(Value::CreateBooleanValue(cancel_result));
   SendResponse(true);
 
   return true;
 }
 
 }  // namespace extensions