Delete the non-static CLD data source logic.

components/translate/content/renderer/renderer_cld_data_provider.h

-// Copyright 2014 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.
-
-// NOT DEAD CODE!
-// This code isn't dead, even if it isn't currently being used. Please refer to:
-// https://www.chromium.org/developers/how-tos/compact-language-detector-cld-data-source-configuration
-
-#ifndef COMPONENTS_TRANSLATE_CONTENT_RENDERER_RENDERER_CLD_DATA_PROVIDER_H_
-#define COMPONENTS_TRANSLATE_CONTENT_RENDERER_RENDERER_CLD_DATA_PROVIDER_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "ipc/ipc_listener.h"
-
-namespace IPC {
-class Message;
-}
-
-namespace translate {
-
-// Renderer-side interface responsible for providing CLD data.
-// The embedder should set an instance as soon as feasible during startup.
-// The implementation must be paired with a browser-side implementation of
-// the BrowserCldDataProvider class, typically created by a
-// BrowserCldDataProviderFactory:
-//   ../browser/browser_cld_data_provider_factory.h
-//   ../browser/browser_cld_data_provider.h
-//
-// The glue between the browser and renderer processes is typically a pair of
-// request/response IPC messages using the CldDataProviderMsgStart
-// "IPCMessageStart" enumerated constant from ipc_message_start.h.
-class RendererCldDataProvider : public IPC::Listener {
- public:
-  RendererCldDataProvider();
-  ~RendererCldDataProvider() override {}
-
-  // (Inherited from IPC::Listener)
-  // If the specified message is a response for CLD data, attempts to
-  // initialize CLD2 and returns true in all cases. If initialization is
-  // successful and a callback has been configured via
-  // SetCldAvailableCallback(...), that callback is invoked from the message
-  // loop thread.
-  // This method is defined as virtual in order to force the implementation to
-  // define the specific IPC message(s) that it handles.
-  // The default implementation does nothing and returns false.
-  bool OnMessageReceived(const IPC::Message& message) override;
-
-  // Invoked by the renderer process to request that CLD data be obtained and
-  // that CLD be initialized with it. The implementation is expected to
-  // communicate with the paired BrowserCldDataProvider implementation on the
-  // browser side.
-  // This method must be invoked on the message loop thread.
-  // The default implementation does nothing.
-  virtual void SendCldDataRequest() {}
-
-  // Convenience method that tracks whether or not CLD data is available.
-  // This method can be used in the absence of a callback (i.e., if the caller
-  // wants a simple way to check the state of CLD data availability without
-  // keeping a separate boolean flag tripped by a callback).
-  // The default implementation always returns true.
-  virtual bool IsCldDataAvailable();
-
-  // Sets a callback that will be invoked when CLD data is successfully
-  // obtained from the paired BrowserCldDataProvider implementation on the
-  // browser side, after CLD has been successfully initialized.
-  // Both the initialization of CLD2 as well as the invocation of the callback
-  // must happen on the message loop thread.
-  // The default implementation immediately invokes the callback.
-  virtual void SetCldAvailableCallback(base::Callback<void(void)> callback);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(RendererCldDataProvider);
-};
-
-}  // namespace translate
-
-#endif  // COMPONENTS_TRANSLATE_CONTENT_RENDERER_RENDERER_CLD_DATAP_PROVIDER_H_