Add NetworkHandler to own network handlers in src/chromeos/network

chromeos/network/network_state_handler.h

Index: chromeos/network/network_state_handler.h
diff --git a/chromeos/network/network_state_handler.h b/chromeos/network/network_state_handler.h
index a68e33ad1013d4d1cbc955a9461bd7c89e4c493b..d9768c82d8021cb2005a307cb76e2fe7c0c3b071 100644
--- a/chromeos/network/network_state_handler.h
+++ b/chromeos/network/network_state_handler.h
@@ -16,6 +16,7 @@
 #include "base/observer_list.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/network/managed_state.h"
+#include "chromeos/network/network_handler.h"
 #include "chromeos/network/network_handler_callbacks.h"
 #include "chromeos/network/shill_property_handler.h"
 
@@ -67,18 +68,6 @@ class CHROMEOS_EXPORT NetworkStateHandler
 
   virtual ~NetworkStateHandler();
 
-  // Sets the global instance. Must be called before any calls to Get().
-  static void Initialize();
-
-  // Returns true if the global instance has been initialized.
-  static bool IsInitialized();
-
-  // Destroys the global instance.
-  static void Shutdown();
-
-  // Gets the global instance. Initialize() must be called first.
-  static NetworkStateHandler* Get();
-
   // Add/remove observers.
   void AddObserver(NetworkStateHandlerObserver* observer);
   void RemoveObserver(NetworkStateHandlerObserver* observer);
@@ -167,12 +156,16 @@ class CHROMEOS_EXPORT NetworkStateHandler
   void GetNetworkStatePropertiesForTest(
       base::DictionaryValue* dictionary) const;
 
+  // Construct and initialize an instance for testing.
+  static NetworkStateHandler* InitializeForTest();
+
   static const char kMatchTypeDefault[];
   static const char kMatchTypeWireless[];
   static const char kMatchTypeMobile[];
   static const char kMatchTypeNonVirtual[];
 
  protected:
+  friend class NetworkHandler;
   NetworkStateHandler();
 
   // ShillPropertyHandler::Listener overrides.
@@ -215,7 +208,7 @@ class CHROMEOS_EXPORT NetworkStateHandler
   virtual void ManagedStateListChanged(
       ManagedState::ManagedType type) OVERRIDE;
 
-  // Called in Initialize(). Called explicitly by tests after adding
+  // Called after construction. Called explicitly by tests after adding
   // test observers.
   void InitShillPropertyHandler();