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

content/child/npapi/webplugin_delegate_impl.cc

Index: content/child/npapi/webplugin_delegate_impl.cc
diff --git a/content/child/npapi/webplugin_delegate_impl.cc b/content/child/npapi/webplugin_delegate_impl.cc
index 18149c378bf94231c02136e880bfacb95b160c10..e115cab0540a1ec244050d6a3f7f868de901d8ea 100644
--- a/content/child/npapi/webplugin_delegate_impl.cc
+++ b/content/child/npapi/webplugin_delegate_impl.cc
@@ -193,18 +193,6 @@ bool WebPluginDelegateImpl::GetFormValue(base::string16* value) {
   return instance_->GetFormValue(value);
 }
 
-void WebPluginDelegateImpl::DidFinishLoadWithReason(const GURL& url,
-                                                    NPReason reason,
-                                                    int notify_id) {
-  if (quirks_ & PLUGIN_QUIRK_ALWAYS_NOTIFY_SUCCESS &&
-      reason == NPRES_NETWORK_ERR) {
-    // Flash needs this or otherwise it unloads the launching swf object.
-    reason = NPRES_DONE;
-  }
-
-  instance()->DidFinishLoadWithReason(url, reason, notify_id);
-}
-
 int WebPluginDelegateImpl::GetProcessId() {
   // We are in process, so the plugin pid is this current process pid.
   return base::GetCurrentProcId();
@@ -212,9 +200,8 @@ int WebPluginDelegateImpl::GetProcessId() {
 
 void WebPluginDelegateImpl::SendJavaScriptStream(const GURL& url,
                                                  const std::string& result,
-                                                 bool success,
-                                                 int notify_id) {
-  instance()->SendJavaScriptStream(url, result, success, notify_id);
+                                                 bool success) {
+  instance()->SendJavaScriptStream(url, result, success);
 }
 
 void WebPluginDelegateImpl::DidReceiveManualResponse(
@@ -290,9 +277,9 @@ bool WebPluginDelegateImpl::IsUserGesture(const WebInputEvent& event) {
 }
 
 WebPluginResourceClient* WebPluginDelegateImpl::CreateResourceClient(
-    unsigned long resource_id, const GURL& url, int notify_id) {
+    unsigned long resource_id, const GURL& url) {
   return instance()->CreateStream(
-      resource_id, url, std::string(), notify_id);
+      resource_id, url, std::string());
 }
 
 WebPluginResourceClient* WebPluginDelegateImpl::CreateSeekableResourceClient(
@@ -305,7 +292,6 @@ WebPluginResourceClient* WebPluginDelegateImpl::CreateSeekableResourceClient(
 }
 
 void WebPluginDelegateImpl::FetchURL(unsigned long resource_id,
-                                     int notify_id,
                                      const GURL& url,
                                      const GURL& first_party_for_cookies,
                                      const std::string& method,
@@ -320,7 +306,7 @@ void WebPluginDelegateImpl::FetchURL(unsigned long resource_id,
   // TODO(jam): once we switch over to resource loading always happening in this
   // code path, remove WebPluginResourceClient abstraction.
   PluginStreamUrl* plugin_stream = instance()->CreateStream(
-      resource_id, url, std::string(), notify_id);
+      resource_id, url, std::string());
 
   bool copy_stream_data = !!(quirks_ & PLUGIN_QUIRK_COPY_STREAM_DATA);
   plugin_stream->SetPluginURLFetcher(new PluginURLFetcher(