BrowserPlugin: Simplify content/public API

content/public/browser/browser_plugin_guest_manager_delegate.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/browser/browser_plugin_guest_manager_delegate.h"
 
 namespace content {
 
 int BrowserPluginGuestManagerDelegate::GetNextInstanceID() {
   return 0;
 }
 
-WebContents* BrowserPluginGuestManagerDelegate::GetGuestByInstanceID(
-    int guest_instance_id,
-    int embedder_render_process_id) {
-  return NULL;
-}
-
-bool BrowserPluginGuestManagerDelegate::CanEmbedderAccessInstanceIDMaybeKill(
-    int embedder_render_process_id,
-    int guest_instance_id) {
-  return false;
-}
-
-bool BrowserPluginGuestManagerDelegate::CanEmbedderAccessInstanceID(
-    int embedder_render_process_id,
-    int guest_instance_id) {
-  return false;
-}
-
 content::SiteInstance* BrowserPluginGuestManagerDelegate::GetGuestSiteInstance(
     const GURL& guest_site) {
   return NULL;
 }
 
 bool BrowserPluginGuestManagerDelegate::ForEachGuest(
     WebContents* embedder_web_contents,
     const GuestCallback& callback) {
   return false;
 }
 
 }  // content