Cache Storage: Move files to content/*/cache_storage, rename classes

content/browser/service_worker/service_worker_cache.proto

-// Copyright 2014 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.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-package content;
-
-message ServiceWorkerCacheStorageIndex {
-  message Cache {
-    required string name = 1;
-  }
-  repeated Cache cache = 1;
-  optional string origin = 2;
-}
-
-message ServiceWorkerCacheHeaderMap {
-  required string name = 1;
-  required string value = 2;
-}
-
-message ServiceWorkerCacheRequest {
-  required string method = 1;
-  repeated ServiceWorkerCacheHeaderMap headers = 2;
-}
-
-message ServiceWorkerCacheResponse {
-  enum ResponseType {
-    BASIC_TYPE = 0;
-    CORS_TYPE = 1;
-    DEFAULT_TYPE = 2;
-    ERROR_TYPE = 3;
-    OPAQUE_TYPE = 4;
-  }
-
-  required int32 status_code = 1;
-  required string status_text = 2;
-  required ResponseType response_type = 3;
-  repeated ServiceWorkerCacheHeaderMap headers = 4;
-  optional string url = 5;
-}
-
-message ServiceWorkerCacheMetadata {
-  required ServiceWorkerCacheRequest request = 1;
-  required ServiceWorkerCacheResponse response = 2;
-}