[WebView] Remove more redundant classes

android_webview/browser/aw_http_auth_handler_base.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 ANDROID_WEBVIEW_BROWSER_AW_HTTP_AUTH_HANDLER_BASE_H_
-#define ANDROID_WEBVIEW_BROWSER_AW_HTTP_AUTH_HANDLER_BASE_H_
-
-namespace content {
-class WebContents;
-};
-
-namespace net {
-class AuthChallengeInfo;
-};
-
-namespace android_webview {
-
-class AwLoginDelegate;
-
-// browser/ layer interface for AwHttpAuthHandler (which is implemented in the
-// native/ layer as a native version of the Java class of the same name). This
-// allows the browser/ layer to be unaware of JNI/Java shenanigans.
-class AwHttpAuthHandlerBase {
- public:
-  static AwHttpAuthHandlerBase* Create(AwLoginDelegate* login_delegate,
-                                       net::AuthChallengeInfo* auth_info,
-                                       bool first_auth_attempt);
-  virtual ~AwHttpAuthHandlerBase();
-
-  // Provides an 'escape-hatch' out to Java for the browser/ layer
-  // AwLoginDelegate.
-  virtual bool HandleOnUIThread(content::WebContents*) = 0;
-};
-
-}  // namespace android_webview
-
-#endif  // ANDROID_WEBVIEW_BROWSER_AW_HTTP_AUTH_HANDLER_BASE_H_