Fix some webview plugin attach-ment code.

We would show error message on attach failure now, we used to always return true from attachWindowAndSetUpEvents().
attachWindowAndSetUpEvents() now return the value of -internal-attach call. -internal-attach did not used to return value, now it returns the status of the attachment call from BrowserPluginBindings.

Removed 3 unused variables referring to browserPluginNode.

BUG=None

Review URL: https://codereview.chromium.org/284183013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272634 0039d316-1c4b-4281-b951-d872f2087c98

chrome/renderer/resources/extensions/web_view.js

@@ -706,9 +706,7 @@ WebViewInternal.prototype.handleDialogEvent =
   };
 
   var self = this;
-  var browserPluginNode = this.browserPluginNode;
   var webviewNode = this.webviewNode;
-
   var requestId = event.requestId;
   var actionTaken = false;
 
@@ -823,7 +821,6 @@ WebViewInternal.prototype.handleNewWindowEvent =
   };
 
   var self = this;
-  var browserPluginNode = this.browserPluginNode;
   var webviewNode = this.webviewNode;
 
   var requestId = event.requestId;
@@ -929,9 +926,7 @@ WebViewInternal.prototype.handlePermissionEvent =
     return;
   }
 
-  var browserPluginNode = this.browserPluginNode;
   var webviewNode = this.webviewNode;
-
   var decisionMade = false;
 
   var validateCall = function() {
@@ -1078,9 +1073,7 @@ WebViewInternal.prototype.attachWindowAndSetUpEvents = function(instanceId) {
     this.setupEvent(eventName, events[eventName]);
   }
 
-  this.browserPluginNode['-internal-attach'](this.instanceId, params);
-
-  return true;
+  return this.browserPluginNode['-internal-attach'](this.instanceId, params);
 };
 
 // Registers browser plugin <object> custom element.

content/renderer/browser_plugin/browser_plugin_bindings.cc

@@ -236,6 +236,13 @@ class BrowserPluginBindingAttach: public BrowserPluginMethodBinding {
   virtual bool Invoke(BrowserPluginBindings* bindings,
                       const NPVariant* args,
                       NPVariant* result) OVERRIDE {
+    bool attached = InvokeHelper(bindings, args);
+    BOOLEAN_TO_NPVARIANT(attached, *result);
+    return true;
+  }
+
+ private:
+  bool InvokeHelper(BrowserPluginBindings* bindings, const NPVariant* args) {
     if (!bindings->instance()->render_view())
       return false;
 
@@ -259,8 +266,6 @@ class BrowserPluginBindingAttach: public BrowserPluginMethodBinding {
     bindings->instance()->Attach(instance_id, extra_params.Pass());
     return true;
   }
-
- private:
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginBindingAttach);
 };