Remove BrowserPlugin's -internal-attach method

content/public/browser/browser_plugin_guest_manager.h

Index: content/public/browser/browser_plugin_guest_manager.h
diff --git a/content/public/browser/browser_plugin_guest_manager.h b/content/public/browser/browser_plugin_guest_manager.h
index 9839dfb91c1aa8c182853a728f954d5e51ec8829..0a901329d9fea2c7b30f7a1722f3b7307e53f48b 100644
--- a/content/public/browser/browser_plugin_guest_manager.h
+++ b/content/public/browser/browser_plugin_guest_manager.h
@@ -39,6 +39,13 @@ class CONTENT_EXPORT BrowserPluginGuestManager {
       int embedder_render_process_id,
       const GuestByInstanceIDCallback& callback) {}
 
+  // Translates a content/ generated instance ID to chrome/ instance ID for a
+  // Browser Plugin.
+  // TODO(lazyboy): This is temporary, once we have clear separation of
+  // content/ vs chrome/ IDs, remove this.
+  virtual int GetGuestInstanceIDForPluginID(WebContents* embedder_web_contents,
+                                            int element_instance_id);
+
   // Iterates over all WebContents belonging to a given |embedder_web_contents|,
   // calling |callback| for each. If one of the callbacks returns true, then
   // the iteration exits early.