Move allocate instance id to chrome/.

content/renderer/browser_plugin/browser_plugin_manager.h

Index: content/renderer/browser_plugin/browser_plugin_manager.h
diff --git a/content/renderer/browser_plugin/browser_plugin_manager.h b/content/renderer/browser_plugin/browser_plugin_manager.h
index 1f71ea68c8320b19305b200600c9107c4779dc7a..636f6ad2d978923a5e5cf4b253174e1838205263 100644
--- a/content/renderer/browser_plugin/browser_plugin_manager.h
+++ b/content/renderer/browser_plugin/browser_plugin_manager.h
@@ -49,12 +49,6 @@ class CONTENT_EXPORT BrowserPluginManager
       blink::WebFrame* frame,
       bool auto_navigate) = 0;
 
-  // Asynchronously requests a new browser-process-allocated instance ID.
-  // After the browser process allocates an ID, it calls back into the
-  // |browser_plugin| if it's still alive.
-  virtual void AllocateInstanceID(
-      const base::WeakPtr<BrowserPlugin>& browser_plugin) = 0;
-
   void AddBrowserPlugin(int guest_instance_id, BrowserPlugin* browser_plugin);
   void RemoveBrowserPlugin(int guest_instance_id);
   BrowserPlugin* GetBrowserPlugin(int guest_instance_id) const;