Introduce abstractions to allow embedders to test RenderViewHost

chrome/browser/ui/browser_list_unittest.cc

 // Copyright (c) 2011 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/browser_process.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/printing/background_printing_manager.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "chrome/test/base/testing_pref_service.h"
 #include "chrome/test/base/testing_profile_manager.h"
 #include "content/public/browser/web_contents.h"
+#include "content/test/test_renderer_host.h"
 
 typedef BrowserWithTestWindowTest BrowserListTest;
 
 namespace {
 
 // Helper function to iterate and count all the tabs.
 size_t CountAllTabs() {
   size_t count = 0;
   for (TabContentsIterator iterator; !iterator.done(); ++iterator)
     ++count;
   return count;
 }
 
 // Helper function to navigate to the print preview page.
 void NavigateToPrintUrl(TabContentsWrapper* tab, int page_id) {
-  static_cast<content::TestRenderViewHost*>(
+  content::RenderViewHostTester::For(
       tab->web_contents()->GetRenderViewHost())->SendNavigate(
           page_id, GURL(chrome::kChromeUIPrintURL));
 }
 
 }  // namespace
 
 TEST_F(BrowserListTest, TabContentsIteratorVerifyCount) {
   // Make sure we have 1 window to start with.
   EXPECT_EQ(1U, BrowserList::size());
 
@@ skipping 217 matching lines @@
   testing_browser_process->SetProfileManager(profile_manager);
 
   BrowserList::AttemptRestart();
   // Cancel the effects of us calling BrowserList::AttemptRestart. Otherwise
   // tests ran after this one will fail.
   browser_shutdown::SetTryingToQuit(false);
 
   EXPECT_TRUE(testing_pref_service.GetBoolean(prefs::kWasRestarted));
   testing_browser_process->SetLocalState(NULL);
 }