[OfflinePages] Improve visiblity/handling of "Loading not started" case

chrome/browser/android/offline_pages/prerender_adapter_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 "chrome/browser/android/offline_pages/prerender_adapter.h"
 
 #include "base/sys_info.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 167 matching lines @@
     prerender_manager_->SetPrerenderContentsFactoryForTest(
         prerender_contents_factory_);
     prerender_manager_->SetMode(PrerenderManager::PRERENDER_MODE_ENABLED);
   }
   observer_stop_loading_called_ = false;
   observer_dom_content_loaded_called_ = false;
   observer_stop_called_ = false;
   ASSERT_TRUE(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 }
 
-TEST_F(PrerenderAdapterTest, CanPrerender) {
-  // Skip test on low end device until supported.
-  if (base::SysInfo::IsLowEndDevice())
-    return;
-
-  EXPECT_TRUE(adapter()->CanPrerender());
-
-  prerender_manager()->SetMode(PrerenderManager::PRERENDER_MODE_DISABLED);
-  EXPECT_FALSE(adapter()->CanPrerender());
-}
-
 TEST_F(PrerenderAdapterTest, StartPrerenderFailsForUnsupportedScheme) {
   // Skip test on low end device until supported.
   if (base::SysInfo::IsLowEndDevice())
     return;
 
   std::unique_ptr<content::WebContents> session_contents(
       content::WebContents::Create(
           content::WebContents::CreateParams(profile())));
   content::SessionStorageNamespace* sessionStorageNamespace =
       session_contents->GetController().GetDefaultSessionStorageNamespace();
@@ skipping 39 matching lines @@
   EXPECT_EQ(FinalStatus::FINAL_STATUS_CANCELLED, adapter()->GetFinalStatus());
 
   // Exercise access methods even though no interesting values set beneath.
   EXPECT_EQ(nullptr, adapter()->GetWebContents());
 
   adapter()->DestroyActive();
   EXPECT_FALSE(adapter()->IsActive());
 }
 
 }  // namespace offline_pages