Show missing plug-in infobar only if a plug-in is available.

chrome/default_plugin/plugin_installer_base.cc

 // Copyright (c) 2011 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 "chrome/default_plugin/plugin_installer_base.h"
 
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "content/public/common/content_constants.h"
 
 PluginInstallerBase::PluginInstallerBase()
     : renderer_process_id_(0),
       render_view_id_(0) {
 }
 
 PluginInstallerBase::~PluginInstallerBase() {
 }
 
-bool PluginInstallerBase::Initialize(void* module_handle, NPP instance,
-                                     NPMIMEType mime_type, int16 argc,
-                                     char* argn[], char* argv[]) {
+void PluginInstallerBase::SetRoutingIds(int16 argc,
+                                        char* argn[],
+                                        char* argv[]) {
   for (int16_t index = 0; index < argc; ++index) {
     if (!base::strncasecmp(argn[index],
                            content::kDefaultPluginRenderProcessId,
                            strlen(argn[index]))) {
       base::StringToInt(argv[index], &renderer_process_id_);
     } else if (!base::strncasecmp(argn[index],
                                   content::kDefaultPluginRenderViewId,
                                   strlen(argn[index]))) {
       base::StringToInt(argv[index], &render_view_id_);
     }
   }
-  return true;
 }