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

components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
index f071ebb5a6e0f68d5824d913328cbddb5807d8a4..30c3d25b04dbead6949c97757c8cd613a4449f5d 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
@@ -32,6 +32,7 @@
 #include "net/base/host_port_pair.h"
 #include "net/base/load_flags.h"
 #include "net/base/network_change_notifier.h"
+#include "net/log/net_log_source_type.h"
 #include "net/proxy/proxy_server.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
@@ -754,7 +755,7 @@ void DataReductionProxyConfig::SecureProxyCheck(
     const GURL& secure_proxy_check_url,
     FetcherResponseCallback fetcher_callback) {
   bound_net_log_ = net::BoundNetLog::Make(
-      net_log_, net::NetLog::SOURCE_DATA_REDUCTION_PROXY);
+      net_log_, net::NetLogSourceType::DATA_REDUCTION_PROXY);
   if (event_creator_) {
     event_creator_->BeginSecureProxyCheck(
         bound_net_log_, config_values_->secure_proxy_check_url());