Enable offline pages feature on trunk by default

chrome/browser/android/offline_pages/offline_page_tab_helper_unittest.cc

 // Copyright 2016 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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/run_loop.h"
@@ skipping 77 matching lines @@
 };
 
 void OfflinePageTabHelperTest::SetUp() {
   // Creates a test web contents.
   content::RenderViewHostTestHarness::SetUp();
   OfflinePageTabHelper::CreateForWebContents(web_contents());
   offline_page_tab_helper_ =
       OfflinePageTabHelper::FromWebContents(web_contents());
 
   // Enables offline pages feature.
+  // TODO(jianli): Remove this once the feature is completely enabled.
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableOfflinePages);
 
   // Sets up the factory for testing.
   OfflinePageModelFactory::GetInstance()->SetTestingFactoryAndUse(
       browser_context(), BuildTestOfflinePageModel);
   RunUntilIdle();
 
   // Saves an offline page.
   OfflinePageModel* model =
@@ skipping 78 matching lines @@
   GURL online_url = page->url;
 
   StartLoad(online_url);
   EXPECT_EQ(online_url, controller().GetPendingEntry()->GetURL());
 
   FailLoad(online_url);
   EXPECT_EQ(offline_url, controller().GetPendingEntry()->GetURL());
 }
 
 }  // namespace offline_pages