Check whether the Pepper CDM is available before adding the key system.

chrome/browser/plugins/plugin_info_message_filter.cc

Index: chrome/browser/plugins/plugin_info_message_filter.cc
diff --git a/chrome/browser/plugins/plugin_info_message_filter.cc b/chrome/browser/plugins/plugin_info_message_filter.cc
index f2260e43fb3c3949d8472ee8f129d5d37e302e48..398398acdb9bffe0522d89998b725cd261bd4861 100644
--- a/chrome/browser/plugins/plugin_info_message_filter.cc
+++ b/chrome/browser/plugins/plugin_info_message_filter.cc
@@ -97,6 +97,9 @@ bool PluginInfoMessageFilter::OnMessageReceived(const IPC::Message& message,
   IPC_BEGIN_MESSAGE_MAP_EX(PluginInfoMessageFilter, message, *message_was_ok)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(ChromeViewHostMsg_GetPluginInfo,
                                     OnGetPluginInfo)
+    IPC_MESSAGE_HANDLER(
+        ChromeViewHostMsg_IsPepperPluginRegisteredForMimeType,
+        OnIsPepperPluginRegisteredForMimeType)
     IPC_MESSAGE_UNHANDLED(return false)
   IPC_END_MESSAGE_MAP()
   return true;
@@ -164,6 +167,14 @@ void PluginInfoMessageFilter::PluginsLoaded(
   Send(reply_msg);
 }
 
+void PluginInfoMessageFilter::OnIsPepperPluginRegisteredForMimeType(
+    const std::string& mime_type,
+    bool* is_registered) {
+  *is_registered =
+      PluginService::GetInstance()->IsPepperPluginRegisteredForMimeType(
+          mime_type);
+}
+
 void PluginInfoMessageFilter::Context::DecidePluginStatus(
     const GetPluginInfo_Params& params,
     const WebPluginInfo& plugin,