Extracting NetLog inner classes into their own classes.

net/socket/fuzzed_socket.h

Index: net/socket/fuzzed_socket.h
diff --git a/net/socket/fuzzed_socket.h b/net/socket/fuzzed_socket.h
index a16c782efec3987b83b1edaf0d43de8afbc1e868..491b339e382f5533d7ef478194bdc1a16ceca9e4 100644
--- a/net/socket/fuzzed_socket.h
+++ b/net/socket/fuzzed_socket.h
@@ -13,7 +13,7 @@
 #include "net/base/completion_callback.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
-#include "net/log/net_log.h"
+#include "net/log/net_log_with_source.h"
 #include "net/socket/stream_socket.h"
 
 namespace base {
@@ -24,6 +24,7 @@ namespace net {
 
 class IPEndPoint;
 class IOBuffer;
+class NetLog;
 
 // A StreamSocket that uses a FuzzedDataProvider to generate responses. Writes
 // can succeed synchronously or asynchronously, can write some or all of the