Clean up Cloud Print API flow code.

chrome/browser/printing/cloud_print/gcd_api_flow_impl.h

 // Copyright 2014 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_PRINTING_CLOUD_PRINT_GCD_API_FLOW_IMPL_H_
 #define CHROME_BROWSER_PRINTING_CLOUD_PRINT_GCD_API_FLOW_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "chrome/browser/printing/cloud_print/gcd_api_flow.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 
 namespace cloud_print {
 
-namespace {
-const char kCloudPrintOAuthHeaderFormat[] = "Authorization: Bearer %s";
-}
-
 class GCDApiFlowImpl : public GCDApiFlow,
                        public net::URLFetcherDelegate,
                        public OAuth2TokenService::Consumer {
  public:
   // Create an OAuth2-based confirmation.
   GCDApiFlowImpl(net::URLRequestContextGetter* request_context,
                  OAuth2TokenService* token_service,
                  const std::string& account_id);
-
   ~GCDApiFlowImpl() override;
 
+  // GCDApiFlow implementation:
   void Start(std::unique_ptr<Request> request) override;
 
   // net::URLFetcherDelegate implementation:
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // OAuth2TokenService::Consumer implementation:
   void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
                          const std::string& access_token,
                          const base::Time& expiration_time) override;
   void OnGetTokenFailure(const OAuth2TokenService::Request* request,
                          const GoogleServiceAuthError& error) override;
 
  private:
   void CreateRequest(const GURL& url);
 
   std::unique_ptr<net::URLFetcher> url_fetcher_;
   std::unique_ptr<OAuth2TokenService::Request> oauth_request_;
   scoped_refptr<net::URLRequestContextGetter> request_context_;
   OAuth2TokenService* token_service_;
   std::string account_id_;
   std::unique_ptr<Request> request_;
 
   DISALLOW_COPY_AND_ASSIGN(GCDApiFlowImpl);
 };
 
 }  // namespace cloud_print
 
 #endif  // CHROME_BROWSER_PRINTING_CLOUD_PRINT_GCD_API_FLOW_IMPL_H_