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

content/child/npapi/plugin_stream.cc

Index: content/child/npapi/plugin_stream.cc
diff --git a/content/child/npapi/plugin_stream.cc b/content/child/npapi/plugin_stream.cc
index 282f69b1f736d73a119359a86afface7a8553c09..454086386672d469b311b5325946a8ed40216239 100644
--- a/content/child/npapi/plugin_stream.cc
+++ b/content/child/npapi/plugin_stream.cc
@@ -24,12 +24,8 @@ namespace content {
 
 PluginStream::PluginStream(
     PluginInstance* instance,
-    const char* url,
-    bool need_notify,
-    void* notify_data)
+    const char* url)
     : instance_(instance),
-      notify_needed_(need_notify),
-      notify_data_(notify_data),
       close_on_write_data_(false),
       requested_plugin_mode_(NP_NORMAL),
       opened_(false),
@@ -58,7 +54,6 @@ bool PluginStream::Open(const std::string& mime_type,
   stream_.lastmodified = last_modified;
   stream_.pdata = 0;
   stream_.ndata = id->ndata;
-  stream_.notifyData = notify_data_;
   if (!headers_.empty())
     stream_.headers = headers_.c_str();
 
@@ -87,10 +82,8 @@ bool PluginStream::Open(const std::string& mime_type,
   NPError err = instance_->NPP_NewStream((NPMIMEType)char_mime_type,
                                          &stream_, seekable_stream,
                                          &requested_plugin_mode_);
-  if (err != NPERR_NO_ERROR) {
-    Notify(err);
+  if (err != NPERR_NO_ERROR)
     return false;
-  }
 
   opened_ = true;
 
@@ -258,8 +251,6 @@ bool PluginStream::Close(NPReason reason) {
       DCHECK(err == NPERR_NO_ERROR);
     }
   }
-
-  Notify(reason);
   return true;
 }
 
@@ -267,13 +258,6 @@ WebPluginResourceClient* PluginStream::AsResourceClient() {
   return NULL;
 }
 
-void PluginStream::Notify(NPReason reason) {
-  if (notify_needed_) {
-    instance_->NPP_URLNotify(stream_.url, reason, notify_data_);
-    notify_needed_ = false;
-  }
-}
-
 bool PluginStream::RequestedPluginModeIsAsFile() const {
   return (requested_plugin_mode_ == NP_ASFILE ||
           requested_plugin_mode_ == NP_ASFILEONLY);