win: Move a few WeakPtrFactories to the end of their containing classes.

content/child/npapi/webplugin_delegate_impl.h

Index: content/child/npapi/webplugin_delegate_impl.h
diff --git a/content/child/npapi/webplugin_delegate_impl.h b/content/child/npapi/webplugin_delegate_impl.h
index 91eddfa8a0ac20a993f6a93aa3936cebbaae7d2b..96d4a1e2515cf01493bfcac08c3ce578776d6592 100644
--- a/content/child/npapi/webplugin_delegate_impl.h
+++ b/content/child/npapi/webplugin_delegate_impl.h
@@ -437,10 +437,6 @@ class WebPluginDelegateImpl : public WebPluginDelegate {
   // This flag indicates whether we started tracking a user gesture message.
   bool user_gesture_message_posted_;
 
-  // Runnable Method Factory used to invoke the OnUserGestureEnd method
-  // asynchronously.
-  base::WeakPtrFactory<WebPluginDelegateImpl> user_gesture_msg_factory_;
-
   // Handle to the mouse hook installed for certain windowed plugins like
   // flash.
   HHOOK mouse_hook_;
@@ -470,6 +466,12 @@ class WebPluginDelegateImpl : public WebPluginDelegate {
   // True if NPP_New did not return an error.
   bool creation_succeeded_;
 
+#if defined(OS_WIN)
+  // Runnable Method Factory used to invoke the OnUserGestureEnd method
+  // asynchronously.
+  base::WeakPtrFactory<WebPluginDelegateImpl> user_gesture_msg_factory_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(WebPluginDelegateImpl);
 };