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diff --git a/chrome/browser/login_prompt.h b/chrome/browser/login_prompt.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_BROWSER_LOGIN_PROMPT_H__
+#define CHROME_BROWSER_LOGIN_PROMPT_H__
+
+#include <string>
+
+#include "base/basictypes.h"
+
+class AuthChallengeInfo;
+class URLRequest;
+class MessageLoop;
+class TabContents;
+
+// This is the interface for the class that routes authentication info to
+// the URLRequest that needs it.  Used by the automation proxy for testing.
+// These functions should be (and are, in LoginHandlerImpl) implemented in
+// a thread safe manner.
+class LoginHandler {
+ public:
+  // Resend the request with authentication credentials.
+  // This function can be called from either thread.
+  virtual void SetAuth(const std::wstring& username,
+                       const std::wstring& password) = 0;
+
+  // Display the error page without asking for credentials again.
+  // This function can be called from either thread.
+  virtual void CancelAuth() = 0;
+
+  // Notify the handler that the request was cancelled.
+  // This function can only be called from the IO thread.
+  virtual void OnRequestCancelled() = 0;
+};
+
+// Details to provide the NotificationObserver.  Used by the automation proxy
+// for testing.
+class LoginNotificationDetails {
+public:
+  LoginNotificationDetails(LoginHandler* handler) : handler_(handler) {}
+  LoginHandler* handler() const { return handler_; }
+
+private:
+  LoginNotificationDetails() {}
+
+  LoginHandler* handler_;  // Where to send the response.
+
+  DISALLOW_EVIL_CONSTRUCTORS(LoginNotificationDetails);
+};
+
+// Prompts the user for their username and password.  This is designed to
+// be called on the background (I/O) thread, in response to
+// URLRequest::Delegate::OnAuthRequired.  The prompt will be created
+// on the main UI thread via a call to ui_loop's InvokeLater, and will send the
+// credentials back to the URLRequest on the calling thread.
+// A LoginHandler object (which lives on the calling thread) is returned,
+// which can be used to set or cancel authentication programmatically.  The
+// caller must invoke OnRequestCancelled() on this LoginHandler before
+// destroying the URLRequest.
+LoginHandler* CreateLoginPrompt(AuthChallengeInfo* auth_info,
+                                URLRequest* request,
+                                MessageLoop* ui_loop);
+
+#endif // CHROME_BROWSER_LOGIN_PROMPT_H__