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

content/child/npapi/plugin_stream_url.cc

Index: content/child/npapi/plugin_stream_url.cc
diff --git a/content/child/npapi/plugin_stream_url.cc b/content/child/npapi/plugin_stream_url.cc
index 84490d7de93c7a96cc62863b47695041b9d9943a..545584bbdeaa73a92de12d379c682eccddac184e 100644
--- a/content/child/npapi/plugin_stream_url.cc
+++ b/content/child/npapi/plugin_stream_url.cc
@@ -20,10 +20,8 @@ namespace content {
 PluginStreamUrl::PluginStreamUrl(
     unsigned long resource_id,
     const GURL &url,
-    PluginInstance *instance,
-    bool notify_needed,
-    void *notify_data)
-    : PluginStream(instance, url.spec().c_str(), notify_needed, notify_data),
+    PluginInstance *instance)
+    : PluginStream(instance, url.spec().c_str()),
       url_(url),
       id_(resource_id) {
 }
@@ -90,16 +88,6 @@ void PluginStreamUrl::CancelRequest() {
 }
 
 void PluginStreamUrl::WillSendRequest(const GURL& url, int http_status_code) {
-  if (notify_needed()) {
-    // If the plugin participates in HTTP url redirect handling then notify it.
-    if (net::HttpResponseHeaders::IsRedirectResponseCode(http_status_code) &&
-        instance()->handles_url_redirects()) {
-      pending_redirect_url_ = url.spec();
-      instance()->NPP_URLRedirectNotify(url.spec().c_str(), http_status_code,
-          notify_data());
-      return;
-    }
-  }
   url_ = url;
   UpdateUrl(url.spec().c_str());
 }