[Android WebView] Call shouldInterceptRequest on a background thread

android_webview/browser/net/aw_request_interceptor.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_REQUEST_INTERCEPTOR_H_
-#define ANDROID_WEBVIEW_BROWSER_AW_REQUEST_INTERCEPTOR_H_
+#ifndef ANDROID_WEBVIEW_BROWSER_NET_AW_REQUEST_INTERCEPTOR_H_
+#define ANDROID_WEBVIEW_BROWSER_NET_AW_REQUEST_INTERCEPTOR_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "net/url_request/url_request_interceptor.h"
 
-class GURL;
-
 namespace net {
 class URLRequest;
-class URLRequestContextGetter;
 class URLRequestJob;
 class NetworkDelegate;
 }
 
 namespace android_webview {
 
-class AwWebResourceResponse;
-
 // This class allows the Java-side embedder to substitute the default
 // URLRequest of a given request for an alternative job that will read data
 // from a Java stream.
 class AwRequestInterceptor : public net::URLRequestInterceptor {
  public:
   AwRequestInterceptor();
   ~AwRequestInterceptor() override;
 
   // net::URLRequestInterceptor override --------------------------------------
   net::URLRequestJob* MaybeInterceptRequest(
       net::URLRequest* request,
       net::NetworkDelegate* network_delegate) const override;
 
  private:
-  scoped_ptr<AwWebResourceResponse> QueryForAwWebResourceResponse(
-      net::URLRequest* request) const;
-
   DISALLOW_COPY_AND_ASSIGN(AwRequestInterceptor);
 };
 
 } // namespace android_webview
 
-#endif  // ANDROID_WEBVIEW_BROWSER_AW_REQUEST_INTERCEPTOR_H_
+#endif  // ANDROID_WEBVIEW_BROWSER_NET_AW_REQUEST_INTERCEPTOR_H_