Enable NetworkService by default (see issue #2622).

The NetworkService can still be disabled for a limited time by specifying the
`--disable-features=NetworkService` command-line flag.

libcef/browser/prefs/browser_prefs.cc

@@ -10,6 +10,7 @@
 #include "libcef/browser/prefs/pref_store.h"
 #include "libcef/browser/prefs/renderer_prefs.h"
 #include "libcef/common/cef_switches.h"
+#include "libcef/common/net_service/util.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ -171,7 +172,7 @@ std::unique_ptr<PrefService> CreatePrefService(Profile* profile,
   SSLConfigServiceManager::RegisterPrefs(registry.get());
   update_client::RegisterPrefs(registry.get());
 
-  if (!command_line->HasSwitch(switches::kEnableNetworkService)) {
+  if (!net_service::IsEnabled()) {
     CefURLRequestContextGetter::RegisterPrefs(registry.get());
   } else if (!profile) {
     SystemNetworkContextManager::RegisterPrefs(registry.get());

libcef/common/cef_switches.cc

@@ -116,9 +116,6 @@ const char kEnablePreferenceTesting[] = "enable-preference-testing";
 // Enable date-based expiration of built in network security information.
 const char kEnableNetSecurityExpiration[] = "enable-net-security-expiration";
 
-// Enable the NetworkService.
-const char kEnableNetworkService[] = "enable-network-service";
-
 #if defined(OS_MACOSX)
 // Path to the framework directory.
 const char kFrameworkDirPath[] = "framework-dir-path";

libcef/common/cef_switches.h

@@ -52,7 +52,6 @@ extern const char kPluginPolicy_Detect[];
 extern const char kPluginPolicy_Block[];
 extern const char kEnablePreferenceTesting[];
 extern const char kEnableNetSecurityExpiration[];
-extern const char kEnableNetworkService[];
 
 #if defined(OS_MACOSX)
 extern const char kFrameworkDirPath[];

libcef/common/main_delegate.cc

@@ -46,7 +46,6 @@
 #include "extensions/common/constants.h"
 #include "ipc/ipc_buildflags.h"
 #include "pdf/pdf_ppapi.h"
-#include "services/network/public/cpp/features.h"
 #include "services/service_manager/sandbox/switches.h"
 #include "ui/base/layout.h"
 #include "ui/base/resource/resource_bundle.h"
@@ -567,14 +566,6 @@ bool CefMainDelegate::BasicStartupComplete(int* exit_code) {
       }
     }
 
-    // Disable NetworkService for now
-    // TODO(cef): Implement the required changes for network service
-    if (network::features::kNetworkService.default_state ==
-            base::FEATURE_ENABLED_BY_DEFAULT &&
-        !command_line->HasSwitch(switches::kEnableNetworkService)) {
-      disable_features.push_back(network::features::kNetworkService.name);
-    }
-
     if (!disable_features.empty()) {
       DCHECK(!base::FeatureList::GetInstance());
       std::string disable_features_str =