Clean up most of the ChromeOS headers in non-ChromeOS build

chrome/browser/extensions/api/page_capture/page_capture_apitest.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 "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/threading/thread_restrictions.h"
 #include "chrome/browser/extensions/api/page_capture/page_capture_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/common/chrome_switches.h"
-#include "chromeos/login/login_state.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/browser/extension_dialog_auto_confirm.h"
 #include "net/dns/mock_host_resolver.h"
 
+#if defined(OS_CHROMEOS)
+#include "chromeos/login/login_state.h"
+#endif  // defined(OS_CHROMEOS)
+
 using extensions::PageCaptureSaveAsMHTMLFunction;
 using extensions::ScopedTestDialogAutoConfirm;
 
 class ExtensionPageCaptureApiTest : public ExtensionApiTest {
  public:
   void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII(switches::kJavaScriptFlags, "--expose-gc");
   }
   void SetUpOnMainThread() override {
@@ skipping 60 matching lines @@
   // Set Public Session state.
   chromeos::LoginState::Get()->SetLoggedInState(
       chromeos::LoginState::LOGGED_IN_ACTIVE,
       chromeos::LoginState::LOGGED_IN_USER_PUBLIC_ACCOUNT);
   // Resolve Permission dialog with Deny.
   ScopedTestDialogAutoConfirm auto_confirm(ScopedTestDialogAutoConfirm::CANCEL);
   ASSERT_TRUE(RunExtensionTestWithArg("page_capture", "REQUEST_DENIED"))
       << message_;
 }
 #endif  // defined(OS_CHROMEOS)