Remove renderer notifications of memory pressure.

content/browser/memory/memory_message_filter.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_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_
-#define CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_
-
-#include "base/macros.h"
-#include "base/memory/memory_pressure_listener.h"
-#include "content/common/content_export.h"
-#include "content/public/browser/browser_message_filter.h"
-#include "content/public/common/process_type.h"
-
-namespace content {
-
-class BrowserChildProcessHost;
-class RenderProcessHost;
-
-// This class sends memory messages from the browser process.
-// See also: child_memory_message_filter.h
-class CONTENT_EXPORT MemoryMessageFilter : public BrowserMessageFilter {
- public:
-  MemoryMessageFilter(const BrowserChildProcessHost* child_process_host,
-                      ProcessType process_type);
-  MemoryMessageFilter(const RenderProcessHost* render_process_host);
-
-  // BrowserMessageFilter implementation.
-  void OnFilterAdded(IPC::Channel* channel) override;
-  void OnChannelClosing() override;
-  bool OnMessageReceived(const IPC::Message& message) override;
-
-  void SendSetPressureNotificationsSuppressed(bool suppressed);
-  void SendSimulatePressureNotification(
-      base::MemoryPressureListener::MemoryPressureLevel level);
-  void SendPressureNotification(
-      base::MemoryPressureListener::MemoryPressureLevel level);
-
- protected:
-  friend class MemoryPressureControllerImpl;
-
-  ~MemoryMessageFilter() override;
-
-  const void* process_host() const { return process_host_; }
-  ProcessType process_type() const { return process_type_; }
-
- private:
-  // The untyped process host and ProcessType associated with this filter
-  // instance. The process host is stored as untyped because it is only used as
-  // a key in MemoryPressureControllerImpl; at no point is it ever deferenced to
-  // invoke any members on a process host.
-  const void* process_host_;
-  ProcessType process_type_;
-
-  DISALLOW_COPY_AND_ASSIGN(MemoryMessageFilter);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_