Base infrastructure for Networking Private API on Windows and Mac.

chrome/browser/extensions/api/networking_private/networking_private_api.h

Index: chrome/browser/extensions/api/networking_private/networking_private_api.h
diff --git a/chrome/browser/extensions/api/networking_private/networking_private_api.h b/chrome/browser/extensions/api/networking_private/networking_private_api.h
index 08b27089365c3b6cdb74084d60eadbf36f937193..0d4b9ec81f28c24cda931ca256855629ea468ddd 100644
--- a/chrome/browser/extensions/api/networking_private/networking_private_api.h
+++ b/chrome/browser/extensions/api/networking_private/networking_private_api.h
@@ -120,7 +120,7 @@ class NetworkingPrivateCreateNetworkFunction : public AsyncExtensionFunction {
 
 // Implements the chrome.networkingPrivate.getVisibleNetworks method.
 class NetworkingPrivateGetVisibleNetworksFunction
-    : public SyncExtensionFunction {
+    : public AsyncExtensionFunction {
  public:
   NetworkingPrivateGetVisibleNetworksFunction() {}
   DECLARE_EXTENSION_FUNCTION("networkingPrivate.getVisibleNetworks",
@@ -129,10 +129,12 @@ class NetworkingPrivateGetVisibleNetworksFunction
  protected:
   virtual ~NetworkingPrivateGetVisibleNetworksFunction();
 
-  // SyncExtensionFunction overrides.
+  // AsyncExtensionFunction overrides.
   virtual bool RunImpl() OVERRIDE;
 
  private:
+  void ResultCallback(const base::ListValue& network_list);
+
   DISALLOW_COPY_AND_ASSIGN(NetworkingPrivateGetVisibleNetworksFunction);
 };