Extracted NetLog class's inner enum types into their own enum classes and

ios/chrome/browser/ios_chrome_io_thread.mm

 // 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 "ios/chrome/browser/ios_chrome_io_thread.h"
 
 #include <stddef.h>
 
 #include <utility>
 #include <vector>
@@ skipping 42 matching lines @@
 #include "net/cookies/cookie_monster.h"
 #include "net/cookies/cookie_store.h"
 #include "net/dns/host_cache.h"
 #include "net/dns/host_resolver.h"
 #include "net/dns/mapped_host_resolver.h"
 #include "net/http/http_auth_filter.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_auth_preferences.h"
 #include "net/http/http_network_layer.h"
 #include "net/http/http_server_properties_impl.h"
+#include "net/log/net_log_event_type.h"
 #include "net/nqe/external_estimate_provider.h"
 #include "net/nqe/network_quality_estimator.h"
 #include "net/proxy/proxy_config_service.h"
 #include "net/proxy/proxy_script_fetcher_impl.h"
 #include "net/proxy/proxy_service.h"
 #include "net/socket/tcp_client_socket.h"
 #include "net/spdy/spdy_session.h"
 #include "net/ssl/channel_id_service.h"
 #include "net/ssl/default_channel_id_store.h"
 #include "net/url_request/data_protocol_handler.h"
@@ skipping 80 matching lines @@
   ~LoggingNetworkChangeObserver() override {
     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
     net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
   }
 
   // NetworkChangeNotifier::IPAddressObserver implementation.
   void OnIPAddressChanged() override {
     VLOG(1) << "Observed a change to the network IP addresses";
 
-    net_log_->AddGlobalEntry(net::NetLog::TYPE_NETWORK_IP_ADDRESSES_CHANGED);
+    net_log_->AddGlobalEntry(
+                         net::NetLogEventType::NETWORK_IP_ADDRESSES_CHANGED);
   }
 
   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
   void OnConnectionTypeChanged(
       net::NetworkChangeNotifier::ConnectionType type) override {
     std::string type_as_string =
         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 
     VLOG(1) << "Observed a change to network connectivity state "
             << type_as_string;
 
     net_log_->AddGlobalEntry(
-        net::NetLog::TYPE_NETWORK_CONNECTIVITY_CHANGED,
+        net::NetLogEventType::NETWORK_CONNECTIVITY_CHANGED,
         net::NetLog::StringCallback("new_connection_type", &type_as_string));
   }
 
   // NetworkChangeNotifier::NetworkChangeObserver implementation.
   void OnNetworkChanged(
       net::NetworkChangeNotifier::ConnectionType type) override {
     std::string type_as_string =
         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 
     VLOG(1) << "Observed a network change to state " << type_as_string;
 
     net_log_->AddGlobalEntry(
-        net::NetLog::TYPE_NETWORK_CHANGED,
+        net::NetLogEventType::NETWORK_CHANGED,
         net::NetLog::StringCallback("new_connection_type", &type_as_string));
   }
 
  private:
   net::NetLog* net_log_;
   DISALLOW_COPY_AND_ASSIGN(LoggingNetworkChangeObserver);
 };
 
 class SystemURLRequestContextGetter : public net::URLRequestContextGetter {
  public:
@@ skipping 362 matching lines @@
 
   globals->system_http_network_session.reset(
       new net::HttpNetworkSession(system_params));
   globals->system_http_transaction_factory.reset(
       new net::HttpNetworkLayer(globals->system_http_network_session.get()));
   context->set_http_transaction_factory(
       globals->system_http_transaction_factory.get());
 
   return context;
 }