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

net/http/http_proxy_client_socket_wrapper.cc

Index: net/http/http_proxy_client_socket_wrapper.cc
diff --git a/net/http/http_proxy_client_socket_wrapper.cc b/net/http/http_proxy_client_socket_wrapper.cc
index 6be76b5bb7b2205f693652646d886a9d054e8839..5f8c937ec6e4dbffc5d25bb81e1bb8ec7269650d 100644
--- a/net/http/http_proxy_client_socket_wrapper.cc
+++ b/net/http/http_proxy_client_socket_wrapper.cc
@@ -15,6 +15,8 @@
 #include "net/base/proxy_delegate.h"
 #include "net/http/http_proxy_client_socket.h"
 #include "net/http/http_response_info.h"
+#include "net/log/net_log_event_type.h"
+#include "net/log/net_log_source_type.h"
 #include "net/socket/client_socket_handle.h"
 #include "net/spdy/spdy_proxy_client_socket.h"
 #include "net/spdy/spdy_session.h"
@@ -67,9 +69,10 @@ HttpProxyClientSocketWrapper::HttpProxyClientSocketWrapper(
                        http_auth_cache,
                        http_auth_handler_factory)
                  : nullptr),
-      net_log_(BoundNetLog::Make(net_log.net_log(),
-                                 NetLog::SOURCE_PROXY_CLIENT_SOCKET_WRAPPER)) {
-  net_log_.BeginEvent(NetLog::TYPE_SOCKET_ALIVE,
+      net_log_(
+          BoundNetLog::Make(net_log.net_log(),
+                            NetLogSourceType::PROXY_CLIENT_SOCKET_WRAPPER)) {
+  net_log_.BeginEvent(NetLogEventType::SOCKET_ALIVE,
                       net_log.source().ToEventParametersCallback());
   DCHECK(transport_params || ssl_params);
   DCHECK(!transport_params || !ssl_params);
@@ -79,7 +82,7 @@ HttpProxyClientSocketWrapper::~HttpProxyClientSocketWrapper() {
   // Make sure no sockets are returned to the lower level socket pools.
   Disconnect();
 
-  net_log_.EndEvent(NetLog::TYPE_SOCKET_ALIVE);
+  net_log_.EndEvent(NetLogEventType::SOCKET_ALIVE);
 }
 
 LoadState HttpProxyClientSocketWrapper::GetConnectLoadState() const {