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

net/filter/filter.cc

Index: net/filter/filter.cc
diff --git a/net/filter/filter.cc b/net/filter/filter.cc
index ea7eca6bc726d8955220fc85120f3f83f3883b6a..9c099173a338c7437111f78185a5e7b9d638dd0b 100644
--- a/net/filter/filter.cc
+++ b/net/filter/filter.cc
@@ -31,6 +31,7 @@
 #include "net/filter/brotli_filter.h"
 #include "net/filter/gzip_filter.h"
 #include "net/filter/sdch_filter.h"
+#include "net/log/net_log_event_type.h"
 #include "net/url_request/url_request_context.h"
 #include "url/gurl.h"
 
@@ -58,7 +59,7 @@ void LogSdchProblem(const FilterContext& filter_context,
                     SdchProblemCode problem) {
   SdchManager::SdchErrorRecovery(problem);
   filter_context.GetNetLog().AddEvent(
-      NetLog::TYPE_SDCH_DECODING_ERROR,
+      NetLogEventType::SDCH_DECODING_ERROR,
       base::Bind(&NetLogSdchResourceProblemCallback, problem));
 }