Handle plugin instance crash in ContentDecryptorDelegate.

content/renderer/media/crypto/ppapi_decryptor.h

Index: content/renderer/media/crypto/ppapi_decryptor.h
diff --git a/content/renderer/media/crypto/ppapi_decryptor.h b/content/renderer/media/crypto/ppapi_decryptor.h
index 95c5f74a4c3e9a23efabc23e486d6206c9041bce..a51824f9e7e8f9f9c8801becf64a4b6fe8695c78 100644
--- a/content/renderer/media/crypto/ppapi_decryptor.h
+++ b/content/renderer/media/crypto/ppapi_decryptor.h
@@ -73,7 +73,8 @@ class PpapiDecryptor : public media::MediaKeys, public media::Decryptor {
   virtual void DeinitializeDecoder(StreamType stream_type) OVERRIDE;
 
  private:
-  PpapiDecryptor(const scoped_refptr<PepperPluginInstanceImpl>& plugin_instance,
+  PpapiDecryptor(const std::string& key_system,
+                 const scoped_refptr<PepperPluginInstanceImpl>& plugin_instance,
                  ContentDecryptorDelegate* plugin_cdm_delegate,
                  const media::SessionCreatedCB& session_created_cb,
                  const media::SessionMessageCB& session_message_cb,
@@ -97,6 +98,11 @@ class PpapiDecryptor : public media::MediaKeys, public media::Decryptor {
                       media::MediaKeys::KeyError error_code,
                       int system_code);
 
+  // Callback to notify that a fatal error happened in |plugin_cdm_delegate_|.
+  // The error is terminal and |plugin_cdm_delegate_| should not be used after
+  // this call.
+  void OnFatalPluginError();
+
   base::WeakPtr<PpapiDecryptor> weak_this_;
 
   // Hold a reference of the plugin instance to make sure the plugin outlives