[Presentation API] Remove references to presentation sessions.

content/public/common/presentation_session.h

-// Copyright 2015 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 CONTENT_PUBLIC_COMMON_PRESENTATION_SESSION_H_
-#define CONTENT_PUBLIC_COMMON_PRESENTATION_SESSION_H_
-
-#include <string>
-
-#include "content/common/content_export.h"
-#include "url/gurl.h"
-
-namespace content {
-
-enum PresentationConnectionState {
-  PRESENTATION_CONNECTION_STATE_CONNECTING,
-  PRESENTATION_CONNECTION_STATE_CONNECTED,
-  PRESENTATION_CONNECTION_STATE_CLOSED,
-  PRESENTATION_CONNECTION_STATE_TERMINATED
-};
-
-// TODO(imcheng): Use WENT_AWAY for 1-UA mode when it is implemented
-// (crbug.com/513859).
-enum PresentationConnectionCloseReason {
-  PRESENTATION_CONNECTION_CLOSE_REASON_CONNECTION_ERROR,
-  PRESENTATION_CONNECTION_CLOSE_REASON_CLOSED,
-  PRESENTATION_CONNECTION_CLOSE_REASON_WENT_AWAY
-};
-
-// TODO(imcheng): Rename to PresentationConnectionInfo.
-// Represents a presentation session that has been established via either
-// browser actions or Presentation API.
-struct CONTENT_EXPORT PresentationSessionInfo {
-  PresentationSessionInfo() = default;
-  PresentationSessionInfo(const GURL& presentation_url,
-                          const std::string& presentation_id);
-  ~PresentationSessionInfo();
-
-  static constexpr size_t kMaxIdLength = 256;
-
-  GURL presentation_url;
-  std::string presentation_id;
-};
-
-// Possible reasons why an attempt to create a presentation session failed.
-enum PresentationErrorType {
-  PRESENTATION_ERROR_NO_AVAILABLE_SCREENS,
-  PRESENTATION_ERROR_SESSION_REQUEST_CANCELLED,
-  PRESENTATION_ERROR_NO_PRESENTATION_FOUND,
-  PRESENTATION_ERROR_PREVIOUS_START_IN_PROGRESS,
-  PRESENTATION_ERROR_UNKNOWN,
-};
-
-// Struct returned when an attempt to create a presentation session failed.
-struct CONTENT_EXPORT PresentationError {
-  PresentationError() = default;
-  PresentationError(PresentationErrorType error_type,
-                    const std::string& message);
-  ~PresentationError();
-
-  static constexpr size_t kMaxMessageLength = 256;
-
-  PresentationErrorType error_type;
-  std::string message;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_COMMON_PRESENTATION_SESSION_H_