Revert of Add virtual Initialize methods to PortAllocator and NetworkManager.

webrtc/base/network.h

Index: webrtc/base/network.h
diff --git a/webrtc/base/network.h b/webrtc/base/network.h
index fe51e4eafb62f7467a1c9467968a7e6216795fb7..05943fb9125ea23f9cc24cf7f30f45a7841175ee 100644
--- a/webrtc/base/network.h
+++ b/webrtc/base/network.h
@@ -63,13 +63,6 @@
 
 // Generic network manager interface. It provides list of local
 // networks.
-//
-// Every method of NetworkManager (including the destructor) must be called on
-// the same thread, except for the constructor which may be called on any
-// thread.
-//
-// This allows constructing a NetworkManager subclass on one thread and
-// passing it into an object that uses it on a different thread.
 class NetworkManager : public DefaultLocalAddressProvider {
  public:
   typedef std::vector<Network*> NetworkList;
@@ -91,10 +84,6 @@
 
   // Indicates a failure when getting list of network interfaces.
   sigslot::signal0<> SignalError;
-
-  // This should be called on the NetworkManager's thread before the
-  // NetworkManager is used. Subclasses may override this if necessary.
-  virtual void Initialize() {}
 
   // Start/Stop monitoring of network interfaces
   // list. SignalNetworksChanged or SignalError is emitted immediately