Fix "unused variable" warnings.

chrome/browser/shell_integration.h

 // 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.
 
 #ifndef CHROME_BROWSER_SHELL_INTEGRATION_H_
 #define CHROME_BROWSER_SHELL_INTEGRATION_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 187 matching lines @@
   void UpdateUI(DefaultWebClientState state);
 
   // Called with the default state after the worker is done.
   DefaultWebClientWorkerCallback callback_;
 
   // Used to differentiate UMA metrics for setting the default browser and
   // setting the default protocol client. The pointer must be valid for the
   // lifetime of the worker.
   const char* worker_name_;
 
-  // Wait until Chrome has been confirmed as the default browser before
-  // reporting a successful attempt.
-  bool check_default_should_report_success_ = false;
-
   DISALLOW_COPY_AND_ASSIGN(DefaultWebClientWorker);
 };
 
 // Worker for checking and setting the default browser.
 class DefaultBrowserWorker : public DefaultWebClientWorker {
  public:
   explicit DefaultBrowserWorker(const DefaultWebClientWorkerCallback& callback);
 
  private:
   ~DefaultBrowserWorker() override;
@@ skipping 29 matching lines @@
   void SetAsDefaultImpl(const base::Closure& on_finished_callback) override;
 
   std::string protocol_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultProtocolClientWorker);
 };
 
 }  // namespace shell_integration
 
 #endif  // CHROME_BROWSER_SHELL_INTEGRATION_H_