Delete blimp/helium and remove references to it from dependent targets

blimp/helium/lww_register.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 BLIMP_HELIUM_LWW_REGISTER_H_
-#define BLIMP_HELIUM_LWW_REGISTER_H_
-
-#include <memory>
-
-#include "base/memory/ptr_util.h"
-#include "blimp/helium/blimp_helium_export.h"
-#include "blimp/helium/result.h"
-#include "blimp/helium/revision_generator.h"
-#include "blimp/helium/serializable_struct.h"
-#include "blimp/helium/stream_helpers.h"
-#include "blimp/helium/syncable.h"
-#include "blimp/helium/syncable_common.h"
-#include "blimp/helium/version_vector.h"
-#include "third_party/protobuf/src/google/protobuf/io/coded_stream.h"
-
-namespace blimp {
-namespace helium {
-
-template <class RegisterType>
-struct LwwRegisterChangeset;
-
-// Defines a register that obeys last-writer-wins semantics.
-// In the event of a write conflict, the state of the locally-biased LwwRegister
-// "wins".
-template <class RegisterType>
-class LwwRegister : public Syncable<LwwRegisterChangeset<RegisterType>> {
- public:
-  using Changeset =
-      typename Syncable<LwwRegisterChangeset<RegisterType>>::Changeset;
-
-  LwwRegister(Peer owner, Peer running_as);
-  ~LwwRegister() = default;
-
-  void Set(const RegisterType& value);
-  const RegisterType& Get() const;
-
-  // Syncable implementation.
-  std::unique_ptr<Changeset> CreateChangeset(Revision from) const override;
-  void ApplyChangeset(const Changeset& changeset) override;
-  void ReleaseBefore(Revision checkpoint) override;
-  Revision GetRevision() const override;
-  void SetLocalUpdateCallback(
-      const base::Closure& local_update_callback) override;
-
- private:
-  base::Closure local_update_callback_;
-  VersionVector last_modified_;
-  Bias bias_;
-  RegisterType value_;
-
-  DISALLOW_COPY_AND_ASSIGN(LwwRegister);
-};
-
-template <class RegisterType>
-LwwRegister<RegisterType>::LwwRegister(Peer owner, Peer running_as)
-    : bias_(ComputeBias(owner, running_as)) {}
-
-template <class RegisterType>
-void LwwRegister<RegisterType>::Set(const RegisterType& value) {
-  value_ = value;
-  last_modified_.set_local_revision(GetNextRevision());
-  local_update_callback_.Run();
-}
-
-template <class RegisterType>
-const RegisterType& LwwRegister<RegisterType>::Get() const {
-  return value_;
-}
-
-template <class RegisterType>
-Revision LwwRegister<RegisterType>::GetRevision() const {
-  return last_modified_.local_revision();
-}
-
-template <class RegisterType>
-void LwwRegister<RegisterType>::SetLocalUpdateCallback(
-    const base::Closure& local_update_callback) {
-  local_update_callback_ = local_update_callback;
-}
-
-template <class RegisterType>
-std::unique_ptr<typename LwwRegister<RegisterType>::Changeset>
-LwwRegister<RegisterType>::CreateChangeset(Revision from) const {
-  std::unique_ptr<Changeset> changeset = base::MakeUnique<Changeset>();
-  changeset->last_modified.Set(last_modified_);
-  changeset->value.Set(value_);
-  return changeset;
-}
-
-template <class RegisterType>
-void LwwRegister<RegisterType>::ApplyChangeset(
-    const LwwRegister<RegisterType>::Changeset& changeset) {
-  const VersionVector remote_last_modified = changeset.last_modified().Invert();
-
-  if (last_modified_.CompareWithBias(remote_last_modified, bias_) ==
-      VersionVector::Comparison::LessThan) {
-    value_ = changeset.value();
-  }
-  last_modified_ = last_modified_.MergeWith(remote_last_modified);
-}
-
-template <class RegisterType>
-void LwwRegister<RegisterType>::ReleaseBefore(Revision checkpoint) {
-  // no-op
-}
-
-template <class RegisterType>
-struct LwwRegisterChangeset : public SerializableStruct {
-  LwwRegisterChangeset() : last_modified(this), value(this) {}
-  ~LwwRegisterChangeset() override {}
-
-  Field<VersionVector> last_modified;
-  Field<RegisterType> value;
-};
-
-}  // namespace helium
-}  // namespace blimp
-
-#endif  // BLIMP_HELIUM_LWW_REGISTER_H_