Revert of Hook up the Push API with GCM's new ability to own encryption keys.

components/gcm_driver/crypto/gcm_encryption_provider.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 "components/gcm_driver/crypto/gcm_encryption_provider.h"
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "components/gcm_driver/crypto/gcm_key_store.h"
-#include "components/gcm_driver/crypto/proto/gcm_encryption_data.pb.h"
-
-namespace gcm {
-
-// Directory in the GCM Store in which the encryption database will be stored.
-const base::FilePath::CharType kEncryptionDirectoryName[] =
-    FILE_PATH_LITERAL("Encryption");
-
-GCMEncryptionProvider::GCMEncryptionProvider()
-    : weak_ptr_factory_(this) {
-}
-
-GCMEncryptionProvider::~GCMEncryptionProvider() {
-}
-
-void GCMEncryptionProvider::Init(
-    const base::FilePath& store_path,
-    const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner) {
-  DCHECK(!key_store_);
-
-  base::FilePath encryption_store_path = store_path;
-
-  // |store_path| can be empty in tests, which means that the database should
-  // be created in memory rather than on-disk.
-  if (!store_path.empty())
-    encryption_store_path = store_path.Append(kEncryptionDirectoryName);
-
-  key_store_ = new GCMKeyStore(encryption_store_path, blocking_task_runner);
-}
-
-void GCMEncryptionProvider::GetPublicKey(const std::string& app_id,
-                                         const PublicKeyCallback& callback) {
-  DCHECK(key_store_);
-  key_store_->GetKeys(
-      app_id, base::Bind(&GCMEncryptionProvider::DidGetPublicKey,
-                         weak_ptr_factory_.GetWeakPtr(), app_id, callback));
-}
-
-void GCMEncryptionProvider::DidGetPublicKey(const std::string& app_id,
-                                            const PublicKeyCallback& callback,
-                                            const KeyPair& pair) {
-  if (!pair.IsInitialized()) {
-    key_store_->CreateKeys(
-        app_id, base::Bind(&GCMEncryptionProvider::DidCreatePublicKey,
-                           weak_ptr_factory_.GetWeakPtr(), callback));
-    return;
-  }
-
-  DCHECK_EQ(KeyPair::ECDH_CURVE_25519, pair.type());
-  callback.Run(pair.public_key());
-}
-
-void GCMEncryptionProvider::DidCreatePublicKey(
-    const PublicKeyCallback& callback,
-    const KeyPair& pair) {
-  if (!pair.IsInitialized()) {
-    callback.Run(std::string());
-    return;
-  }
-
-  DCHECK_EQ(KeyPair::ECDH_CURVE_25519, pair.type());
-  callback.Run(pair.public_key());
-}
-
-}  // namespace gcm