[Chromoting] Make the AuthCodeGetter component of the Windows host configurer

remoting/host/setup/win/auth_code_getter.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 "remoting/host/setup/win/auth_code_getter.h"
 
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/scoped_bstr.h"
 #include "base/win/scoped_variant.h"
 #include "remoting/host/setup/oauth_helper.h"
 
 namespace {
 const int kUrlPollIntervalMs = 100;
 }  // namespace remoting
 
 namespace remoting {
 
 AuthCodeGetter::AuthCodeGetter() :
     browser_(NULL),
-    browser_running_(false),
     timer_interval_(base::TimeDelta::FromMilliseconds(kUrlPollIntervalMs)) {
 }
 
 AuthCodeGetter::~AuthCodeGetter() {
   KillBrowser();
 }
 
 void AuthCodeGetter::GetAuthCode(
     base::Callback<void(const std::string&)> on_auth_code) {
-  if (browser_running_) {
+  if (browser_) {
     on_auth_code.Run("");
     return;
   }
   on_auth_code_ = on_auth_code;
   HRESULT hr = browser_.CreateInstance(CLSID_InternetExplorer, NULL,
                                        CLSCTX_LOCAL_SERVER);
   if (FAILED(hr)) {
     on_auth_code_.Run("");
     return;
   }
-  browser_running_ = true;
   base::win::ScopedBstr url(UTF8ToWide(
       GetOauthStartUrl(GetDefaultOauthRedirectUrl())).c_str());
   base::win::ScopedVariant empty_variant;
   hr = browser_->Navigate(url, empty_variant.AsInput(), empty_variant.AsInput(),
                           empty_variant.AsInput(), empty_variant.AsInput());
   if (FAILED(hr)) {
     KillBrowser();
     on_auth_code_.Run("");
     return;
   }
   browser_->put_Visible(VARIANT_TRUE);
   StartTimer();
 }
 
 void AuthCodeGetter::StartTimer() {
   timer_.Start(FROM_HERE, timer_interval_, this, &AuthCodeGetter::OnTimer);
 }
 
 void AuthCodeGetter::OnTimer() {
   std::string auth_code;
   if (TestBrowserUrl(&auth_code)) {
     on_auth_code_.Run(auth_code);
   } else {
     StartTimer();
   }
 }
 
 bool AuthCodeGetter::TestBrowserUrl(std::string* auth_code) {
   *auth_code = "";
-  if (!browser_running_) {
+  if (!browser_) {
     return true;
   }
   base::win::ScopedBstr url;
   HRESULT hr = browser_->get_LocationName(url.Receive());
   if (!SUCCEEDED(hr)) {
     KillBrowser();
     return true;
   }
   *auth_code = GetOauthCodeInUrl(WideToUTF8(static_cast<BSTR>(url)),
                                  GetDefaultOauthRedirectUrl());
   if (!auth_code->empty()) {
     KillBrowser();
     return true;
   }
   return false;
 }
 
 void AuthCodeGetter::KillBrowser() {
-  if (browser_running_) {
+  if (browser_) {
     browser_->Quit();
-    browser_running_ = false;
+    browser_.Release();
   }
 }
 
 }  // namespace remoting