[Sync] Move network-related code from core/ to engine/net/.

components/sync/core/http_post_provider_interface.h

-// Copyright 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 COMPONENTS_SYNC_CORE_HTTP_POST_PROVIDER_INTERFACE_H_
-#define COMPONENTS_SYNC_CORE_HTTP_POST_PROVIDER_INTERFACE_H_
-
-#include <string>
-
-namespace syncer {
-
-// An interface the embedding application (e.g. Chromium) implements to provide
-// required HTTP POST functionality to the syncer backend. This interface is
-// designed for one-time use. You create one, use it, and create another if you
-// want to make a subsequent POST.
-class HttpPostProviderInterface {
- public:
-  // Add additional headers to the request.
-  virtual void SetExtraRequestHeaders(const char* headers) = 0;
-
-  // Set the URL to POST to.
-  virtual void SetURL(const char* url, int port) = 0;
-
-  // Set the type, length and content of the POST payload.
-  // |content_type| is a null-terminated MIME type specifier.
-  // |content| is a data buffer; Do not interpret as a null-terminated string.
-  // |content_length| is the total number of chars in |content|. It is used to
-  // assign/copy |content| data.
-  virtual void SetPostPayload(const char* content_type,
-                              int content_length,
-                              const char* content) = 0;
-
-  // Returns true if the URL request succeeded. If the request failed,
-  // error() may be non-zero and hence contain more information.
-  virtual bool MakeSynchronousPost(int* error_code, int* response_code) = 0;
-
-  // Get the length of the content returned in the HTTP response.
-  // This does not count the trailing null-terminating character returned
-  // by GetResponseContent, so it is analogous to calling string.length.
-  virtual int GetResponseContentLength() const = 0;
-
-  // Get the content returned in the HTTP response.
-  // This is a null terminated string of characters.
-  // Value should be copied.
-  virtual const char* GetResponseContent() const = 0;
-
-  // Get the value of a header returned in the HTTP response.
-  // If the header is not present, returns the empty string.
-  virtual const std::string GetResponseHeaderValue(
-      const std::string& name) const = 0;
-
-  // Abandon any pending POST and unblock caller in MakeSynchronousPost.
-  // This must be safe to call from any thread.
-  virtual void Abort() = 0;
-
- protected:
-  virtual ~HttpPostProviderInterface() {}
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_CORE_HTTP_POST_PROVIDER_INTERFACE_H_