Switch LevelDBWrapper::GetAll to use the new Mojo sync IPC mechanism.

content/browser/level_db_wrapper_impl.h

-// 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.
-
-#ifndef CONTENT_BROWSER_LEVEL_DB_WRAPPER_IMPL_H_
-#define CONTENT_BROWSER_LEVEL_DB_WRAPPER_IMPL_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "content/common/leveldb_wrapper.mojom.h"
-#include "mojo/public/cpp/bindings/binding_set.h"
-
-namespace content {
-
-// This is a wrapper around a leveldb::LevelDBDatabase. It adds a couple of
-// features:
-// 1) Adds the given prefix, if any, to all keys. This allows the sharing of one
-//    database across many, possibly untrusted, consumers and ensuring that they
-//    can't access each other's values.
-// 2) Informs an observer when the given prefix' values are modified by another
-//    process.
-// 3) Throttles requests to avoid overwhelming the disk.
-class LevelDBWrapperImpl : public LevelDBWrapper {
- public:
-  // |no_bindings_callback| will be called when this object has no more
-  // bindings.
-  LevelDBWrapperImpl(const std::string& prefix,
-                     const base::Closure& no_bindings_callback);
-  ~LevelDBWrapperImpl() override;
-
-  void Bind(mojo::InterfaceRequest<LevelDBWrapper> request,
-            LevelDBObserverPtr observer);
-
- private:
-  // LevelDBWrapperImpl:
-  void Put(mojo::Array<uint8_t> key,
-           mojo::Array<uint8_t> value,
-           const mojo::String& source,
-           const PutCallback& callback) override;
-  void Delete(mojo::Array<uint8_t> key,
-              const mojo::String& source,
-              const DeleteCallback& callback) override;
-  void DeleteAll(const mojo::String& source,
-                 const DeleteAllCallback& callback) override;
-  void Get(mojo::Array<uint8_t> key, const GetCallback& callback) override;
-  void GetAll(const GetAllCallback& callback) override;
-
-  void OnConnectionError();
-
-  std::string prefix_;
-  mojo::BindingSet<LevelDBWrapper> bindings_;
-  base::Closure no_bindings_callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(LevelDBWrapperImpl);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_LEVEL_DB_WRAPPER_IMPL_H_