refactor: Enable network service (Part 1) (#17431)

* Convert InspectableWebContentsImpl::LoadNetworkResource to SimpleURLLoader

https://bugs.chromium.org/p/chromium/issues/detail?id=721408

* Plumb creation of network context with the service

atom/browser/net/network_context_service.cc

@@ -0,0 +1,94 @@
+// Copyright (c) 2019 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/net/network_context_service.h"
+
+#include "atom/browser/atom_browser_client.h"
+#include "atom/browser/browser_process_impl.h"
+#include "atom/browser/net/system_network_context_manager.h"
+#include "chrome/common/chrome_constants.h"
+#include "content/public/browser/network_service_instance.h"
+#include "services/network/network_service.h"
+
+namespace atom {
+
+NetworkContextService::NetworkContextService(content::BrowserContext* context)
+    : browser_context_(static_cast<AtomBrowserContext*>(context)),
+      proxy_config_monitor_(browser_context_->prefs()) {}
+
+NetworkContextService::~NetworkContextService() = default;
+
+network::mojom::NetworkContextPtr
+NetworkContextService::CreateNetworkContext() {
+  network::mojom::NetworkContextPtr network_context;
+
+  content::GetNetworkService()->CreateNetworkContext(
+      MakeRequest(&network_context),
+      CreateNetworkContextParams(browser_context_->IsOffTheRecord(),
+                                 browser_context_->GetPath()));
+
+  return network_context;
+}
+
+network::mojom::NetworkContextParamsPtr
+NetworkContextService::CreateNetworkContextParams(bool in_memory,
+                                                  const base::FilePath& path) {
+  network::mojom::NetworkContextParamsPtr network_context_params =
+      g_browser_process->system_network_context_manager()
+          ->CreateDefaultNetworkContextParams();
+
+  network_context_params->user_agent = browser_context_->GetUserAgent();
+
+  network_context_params->accept_language =
+      net::HttpUtil::GenerateAcceptLanguageHeader(
+          AtomBrowserClient::Get()->GetApplicationLocale());
+
+  // Enable the HTTP cache.
+  network_context_params->http_cache_enabled =
+      browser_context_->CanUseHttpCache();
+
+  network_context_params->cookie_manager_params =
+      network::mojom::CookieManagerParams::New();
+
+  // Configure on-disk storage for persistent sessions.
+  if (!in_memory) {
+    // Configure the HTTP cache path and size.
+    network_context_params->http_cache_path =
+        path.Append(chrome::kCacheDirname);
+    network_context_params->http_cache_max_size =
+        browser_context_->GetMaxCacheSize();
+
+    // Currently this just contains HttpServerProperties
+    network_context_params->http_server_properties_path =
+        path.Append(chrome::kNetworkPersistentStateFilename);
+
+    // Configure persistent cookie path.
+    network_context_params->cookie_path = path.Append(chrome::kCookieFilename);
+
+    network_context_params->restore_old_session_cookies = false;
+    network_context_params->persist_session_cookies = false;
+
+    // TODO(deepak1556): Matches the existing behavior https://git.io/fxHMl,
+    // enable encryption as a followup.
+    network_context_params->enable_encrypted_cookies = false;
+
+    network_context_params->transport_security_persister_path = path;
+  }
+
+#if !BUILDFLAG(DISABLE_FTP_SUPPORT)
+  network_context_params->enable_ftp_url_support = true;
+#endif  // !BUILDFLAG(DISABLE_FTP_SUPPORT)
+
+  // Needed for PAC scripts that use data URLs.
+  network_context_params->enable_data_url_support = true;
+
+  proxy_config_monitor_.AddToNetworkContextParams(network_context_params.get());
+
+  BrowserProcessImpl::ApplyProxyModeFromCommandLine(
+      browser_context_->in_memory_pref_store());
+
+  return network_context_params;
+}
+
+}  // namespace atom