Pass result of blockage across content API when new tab blocked.

ui/views/controls/webview/web_dialog_view.cc

Index: ui/views/controls/webview/web_dialog_view.cc
===================================================================
--- ui/views/controls/webview/web_dialog_view.cc	(revision 154977)
+++ ui/views/controls/webview/web_dialog_view.cc	(working copy)
@@ -281,13 +281,15 @@
                                    content::WebContents* new_contents,
                                    WindowOpenDisposition disposition,
                                    const gfx::Rect& initial_pos,
-                                   bool user_gesture) {
+                                   bool user_gesture,
+                                   bool* was_blocked) {
   if (delegate_ && delegate_->HandleAddNewContents(
           source, new_contents, disposition, initial_pos, user_gesture)) {
     return;
   }
   WebDialogWebContentsDelegate::AddNewContents(
-      source, new_contents, disposition, initial_pos, user_gesture);
+      source, new_contents, disposition, initial_pos, user_gesture,
+      was_blocked);
 }
 
 void WebDialogView::LoadingStateChanged(content::WebContents* source) {