Remove renderer notifications of memory pressure.

content/child/memory/child_memory_message_filter.cc

-// 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.
-
-#include "content/child/memory/child_memory_message_filter.h"
-
-#include "content/common/memory_messages.h"
-
-namespace content {
-
-ChildMemoryMessageFilter::ChildMemoryMessageFilter() {}
-
-ChildMemoryMessageFilter::~ChildMemoryMessageFilter() {}
-
-bool ChildMemoryMessageFilter::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(ChildMemoryMessageFilter, message)
-    IPC_MESSAGE_HANDLER(MemoryMsg_SetPressureNotificationsSuppressed,
-                        OnSetPressureNotificationsSuppressed)
-    IPC_MESSAGE_HANDLER(MemoryMsg_SimulatePressureNotification,
-                        OnSimulatePressureNotification)
-    IPC_MESSAGE_HANDLER(MemoryMsg_PressureNotification, OnPressureNotification)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void ChildMemoryMessageFilter::OnSetPressureNotificationsSuppressed(
-    bool suppressed) {
-  // Enable/disable suppressing memory notifications in the child process.
-  base::MemoryPressureListener::SetNotificationsSuppressed(suppressed);
-}
-
-void ChildMemoryMessageFilter::OnSimulatePressureNotification(
-    base::MemoryPressureListener::MemoryPressureLevel level) {
-  // Pass the message to SimulatePressureNotification. This will emit the
-  // message to all listeners even if notifications are suppressed.
-  base::MemoryPressureListener::SimulatePressureNotification(level);
-}
-
-void ChildMemoryMessageFilter::OnPressureNotification(
-    base::MemoryPressureListener::MemoryPressureLevel level) {
-  // Forward the message along the normal notification path. If notifications
-  // are suppressed then the notification will be swallowed.
-  base::MemoryPressureListener::NotifyMemoryPressure(level);
-}
-
-}  // namespace content