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

content/child/npapi/webplugin_delegate.h

Index: content/child/npapi/webplugin_delegate.h
diff --git a/content/child/npapi/webplugin_delegate.h b/content/child/npapi/webplugin_delegate.h
index 8f13c8d80d2ad33ce021ad1a4e9b724e6dd489e4..ee9b70e311a22aa50424544fa013ede09f453303 100644
--- a/content/child/npapi/webplugin_delegate.h
+++ b/content/child/npapi/webplugin_delegate.h
@@ -87,11 +87,6 @@ class WebPluginDelegate {
   // Returns false if the value is not available.
   virtual bool GetFormValue(base::string16* value) = 0;
 
-  // Receives notification about a resource load that the plugin initiated
-  // for a frame.
-  virtual void DidFinishLoadWithReason(const GURL& url, NPReason reason,
-                                       int notify_id) = 0;
-
   // Returns the process id of the process that is running the plugin.
   virtual int GetProcessId() = 0;
 
@@ -99,8 +94,7 @@ class WebPluginDelegate {
   // function.
   virtual void SendJavaScriptStream(const GURL& url,
                                     const std::string& result,
-                                    bool success,
-                                    int notify_id) = 0;
+                                    bool success) = 0;
 
   // Receives notification about data being available.
   virtual void DidReceiveManualResponse(const GURL& url,
@@ -121,8 +115,7 @@ class WebPluginDelegate {
   // Creates a WebPluginResourceClient instance and returns the same.
   virtual WebPluginResourceClient* CreateResourceClient(
       unsigned long resource_id,
-      const GURL& url,
-      int notify_id) = 0;
+      const GURL& url) = 0;
 
   // Creates a WebPluginResourceClient instance for an existing stream that is
   // has become seekable.
@@ -133,7 +126,6 @@ class WebPluginDelegate {
   // loading the plugin data or the plugin calling HandleURLRequest which didn't
   // end up being routed to another frame or being a javscript:// URL.
   virtual void FetchURL(unsigned long resource_id,
-                        int notify_id,
                         const GURL& url,
                         const GURL& first_party_for_cookies,
                         const std::string& method,