Refactor net::NetLog to provide implementation of observer pattern, not just the interface.

remoting/host/vlog_net_log.h

Index: remoting/host/vlog_net_log.h
diff --git a/remoting/host/vlog_net_log.h b/remoting/host/vlog_net_log.h
index d056a3ad24c26a41cad763b6ae50916c4c033db0..393ab1c680492992028dbe5eb8023bab160f55a1 100644
--- a/remoting/host/vlog_net_log.h
+++ b/remoting/host/vlog_net_log.h
@@ -6,6 +6,7 @@
 #define REMOTING_HOST_VLOG_NET_LOG_H_
 
 #include "base/memory/scoped_handle.h"
+#include "base/memory/scoped_ptr.h"
 #include "net/base/net_log.h"
 
 namespace remoting {
@@ -19,18 +20,9 @@ class VlogNetLog : public net::NetLog {
   VlogNetLog();
   virtual ~VlogNetLog();
 
-  // NetLog overrides:
-  virtual void OnAddEntry(const NetLog::Entry& entry) OVERRIDE;
-  virtual uint32 NextID() OVERRIDE;
-  virtual LogLevel GetLogLevel() const OVERRIDE;
-  virtual void AddThreadSafeObserver(ThreadSafeObserver* observer,
-                                     LogLevel log_level) OVERRIDE;
-  virtual void SetObserverLogLevel(ThreadSafeObserver* observer,
-                                   LogLevel log_level) OVERRIDE;
-  virtual void RemoveThreadSafeObserver(ThreadSafeObserver* observer) OVERRIDE;
-
  private:
-  uint32 id_;
+  class Observer;
+  scoped_ptr<Observer> observer_;
 
   DISALLOW_COPY_AND_ASSIGN(VlogNetLog);
 };