Cleanup: Remove unneeded chrome/common/pref_names.h includes.

chrome/browser/ui/startup/session_crashed_infobar_delegate_unittest.cc

 // Copyright (c) 2013 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/ui/startup/session_crashed_infobar_delegate.h"
 
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/run_loop.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/prefs/browser_prefs.h"
 #include "chrome/browser/sessions/session_service_factory.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.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/scoped_testing_local_state.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "components/infobars/core/infobar.h"
 
 class SessionCrashedInfoBarDelegateUnitTest : public BrowserWithTestWindowTest {
  public:
   virtual void SetUp() override {
     static_cast<TestingBrowserProcess*>(g_browser_process)
@@ skipping 58 matching lines @@
   infobar_service =
       InfoBarService::FromWebContents(tab_strip->GetWebContentsAt(0));
   EXPECT_EQ(1U, infobar_service->infobar_count());
 
   // This used to crash.
   infobar->Accept();
 
   // Ramp down the test.
   tab_strip->CloseWebContentsAt(0, TabStripModel::CLOSE_NONE);
 }