Remove PluginLoadObserver and related logic, it was only used for NPAPI.

content/child/npapi/plugin_stream.h

Index: content/child/npapi/plugin_stream.h
diff --git a/content/child/npapi/plugin_stream.h b/content/child/npapi/plugin_stream.h
index 644e16c681b3bcec40bca00a97a40309cfdf12da..ec3cf1e3601f25d7a09e92b42c703b3bc551f6da 100644
--- a/content/child/npapi/plugin_stream.h
+++ b/content/child/npapi/plugin_stream.h
@@ -22,12 +22,9 @@ class WebPluginResourceClient;
 // of a stream for NPAPI notifications and stream position.
 class PluginStream : public base::RefCounted<PluginStream> {

[dcheng, 2015/11/18 18:38:18]

And probably this thing too. KILL IT ALL.

[Nate Chapin, 2015/11/18 23:28:50]

Done.

  public:
-  // Create a new PluginStream object.  If needNotify is true, then the
-  // plugin will be notified when the stream has been fully sent.
+  // Create a new PluginStream object.
   PluginStream(PluginInstance* instance,
-               const char* url,
-               bool need_notify,
-               void* notify_data);
+               const char* url);
 
   // Opens the stream to the Plugin.
   // If the mime-type is not specified, we'll try to find one based on the
@@ -48,9 +45,6 @@ class PluginStream : public base::RefCounted<PluginStream> {
   // Write the result as a file.
   void WriteAsFile();
 
-  // Notify the plugin that a stream is complete.
-  void Notify(NPReason reason);
-
   // Close the stream.
   virtual bool Close(NPReason reason);
 
@@ -68,11 +62,6 @@ class PluginStream : public base::RefCounted<PluginStream> {
 
   void set_seekable(bool seekable) { seekable_stream_ = seekable; }
 
-  // getters for reading the notification related attributes on the stream.
-  bool notify_needed() const { return notify_needed_; }
-
-  void* notify_data() const { return notify_data_; }
-
  protected:
   friend class base::RefCounted<PluginStream>;
 
@@ -124,8 +113,6 @@ class PluginStream : public base::RefCounted<PluginStream> {
   NPStream                      stream_;
   std::string                   headers_;
   scoped_refptr<PluginInstance> instance_;
-  bool                          notify_needed_;
-  void*                         notify_data_;
   bool                          close_on_write_data_;
   uint16                        requested_plugin_mode_;
   bool                          opened_;