Revert of Add MemoryCoordinator

components/memory_coordinator/browser/memory_coordinator.cc

-// Copyright 2016 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 "components/memory_coordinator/browser/memory_coordinator.h"
-
-namespace memory_coordinator {
-
-// The implementation of MemoryCoordinatorHandle. See memory_coordinator.mojom
-// for the role of this class.
-class MemoryCoordinatorHandleImpl : public mojom::MemoryCoordinatorHandle {
- public:
-  MemoryCoordinatorHandleImpl(mojom::MemoryCoordinatorHandleRequest request)
-      : binding_(this, std::move(request)) {
-  }
-
-  // mojom::MemoryCoordinatorHandle implementations:
-
-  void AddChild(mojom::ChildMemoryCoordinatorPtr child) override {
-    DCHECK(!child_.is_bound());
-    child_ = std::move(child);
-  }
-
-  mojom::ChildMemoryCoordinatorPtr& child() { return child_; }
-  mojo::Binding<mojom::MemoryCoordinatorHandle>& binding() { return binding_; }
-
- private:
-  mojom::ChildMemoryCoordinatorPtr child_;
-  mojo::Binding<mojom::MemoryCoordinatorHandle> binding_;
-
-  DISALLOW_COPY_AND_ASSIGN(MemoryCoordinatorHandleImpl);
-};
-
-MemoryCoordinator::MemoryCoordinator() {}
-
-MemoryCoordinator::~MemoryCoordinator() {}
-
-void MemoryCoordinator::CreateHandle(
-    int render_process_id,
-    mojom::MemoryCoordinatorHandleRequest request) {
-  auto handle = new MemoryCoordinatorHandleImpl(std::move(request));
-  handle->binding().set_connection_error_handler(
-      base::Bind(&MemoryCoordinator::OnConnectionError, base::Unretained(this),
-                 render_process_id));
-  children_[render_process_id].reset(handle);
-}
-
-size_t MemoryCoordinator::NumChildrenForTesting() {
-  return children_.size();
-}
-
-void MemoryCoordinator::OnConnectionError(int render_process_id) {
-  children_.erase(render_process_id);
-}
-
-}  // namespace memory_coordinator