Extracting NetLog inner classes into their own classes.

net/url_request/url_request_netlog_params.h

Index: net/url_request/url_request_netlog_params.h
diff --git a/net/url_request/url_request_netlog_params.h b/net/url_request/url_request_netlog_params.h
index e3b92c601b9a94c447e4c3115aa4cee989eab6a7..a42ca3f3bc965ed8ef223399fad1a9d1b3bbe7d3 100644
--- a/net/url_request/url_request_netlog_params.h
+++ b/net/url_request/url_request_netlog_params.h
@@ -7,11 +7,11 @@
 
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
 #include "net/base/net_export.h"
 #include "net/base/request_priority.h"
-#include "net/log/net_log.h"
 
 class GURL;
 
@@ -21,6 +21,8 @@ class Value;
 
 namespace net {
 
+class NetLogCaptureMode;
+
 // Returns a Value containing NetLog parameters for starting a URLRequest.
 NET_EXPORT std::unique_ptr<base::Value> NetLogURLRequestStartCallback(
     const GURL* url,