Use a placeholder instead of the default plugin for missing plug-ins on Mac and Linux.

chrome/browser/renderer_host/chrome_render_message_filter.h

Index: chrome/browser/renderer_host/chrome_render_message_filter.h
diff --git a/chrome/browser/renderer_host/chrome_render_message_filter.h b/chrome/browser/renderer_host/chrome_render_message_filter.h
index adfcf4443def737ab9533652579324e46e54b282..afdd8be82a1b4da273e6473778775e4a2e4649ed 100644
--- a/chrome/browser/renderer_host/chrome_render_message_filter.h
+++ b/chrome/browser/renderer_host/chrome_render_message_filter.h
@@ -14,6 +14,7 @@
 #include "content/common/dom_storage_common.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCache.h"
 
+struct ChromeViewHostMsg_GetPluginInfo_Params;
 struct ExtensionHostMsg_Request_Params;
 class ExtensionInfoMap;
 class FilePath;
@@ -43,6 +44,9 @@ class ChromeRenderMessageFilter : public BrowserMessageFilter {
   friend class BrowserThread;
   friend class DeleteTask<ChromeRenderMessageFilter>;
 
+  typedef base::Callback<void(ChromeViewHostMsg_GetPluginInfo_Params*)>
+      GetPluginInfoCallback;
+
   virtual ~ChromeRenderMessageFilter();
 
   void OnLaunchNaCl(const std::wstring& url,
@@ -117,6 +121,18 @@ class ChromeRenderMessageFilter : public BrowserMessageFilter {
   void OnGetPluginContentSetting(const GURL& policy_url,
                                  const std::string& resource,
                                  ContentSetting* setting);
+  void OnGetPluginInfo(int render_view_id,
+                       const GURL& url,
+                       const GURL& top_origin_url,
+                       const std::string& mime_type,
+                       IPC::Message* reply_msg);
+  void PluginsLoaded(const GetPluginInfoCallback& callback,
+                     IPC::Message* reply_msg);
+  void GetPluginInfo(int render_view_id,
+                     const GURL& url,
+                     const GURL& top_origin_url,
+                     const std::string& mime_type,
+                     ChromeViewHostMsg_GetPluginInfo_Params* params);
   void OnCanTriggerClipboardRead(const GURL& url, bool* allowed);
   void OnCanTriggerClipboardWrite(const GURL& url, bool* allowed);
   void OnGetCookies(const GURL& url,
@@ -137,6 +153,8 @@ class ChromeRenderMessageFilter : public BrowserMessageFilter {
   // Used to look up permissions at database creation time.
   scoped_refptr<HostContentSettingsMap> host_content_settings_map_;
 
+  const content::ResourceContext& resource_context_;
+
   BooleanPrefMember allow_outdated_plugins_;
   BooleanPrefMember always_authorize_plugins_;