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

chrome/browser/notifications/balloon_host.cc

Index: chrome/browser/notifications/balloon_host.cc
===================================================================
--- chrome/browser/notifications/balloon_host.cc	(revision 154307)
+++ chrome/browser/notifications/balloon_host.cc	(working copy)
@@ -77,7 +77,7 @@
   balloon_->ResizeDueToAutoResize(pref_size);
 }
 
-void BalloonHost::AddNewContents(WebContents* source,
+bool BalloonHost::AddNewContents(WebContents* source,
                                  WebContents* new_contents,
                                  WindowOpenDisposition disposition,
                                  const gfx::Rect& initial_pos,
@@ -85,9 +85,10 @@
   Browser* browser = browser::FindLastActiveWithProfile(
       Profile::FromBrowserContext(new_contents->GetBrowserContext()));
   if (browser) {
-    chrome::AddWebContents(browser, NULL, new_contents, disposition,
-                           initial_pos, user_gesture);
+    return chrome::AddWebContents(browser, NULL, new_contents, disposition,
+                                  initial_pos, user_gesture);
   }
+  return true;
 }
 
 void BalloonHost::RenderViewCreated(content::RenderViewHost* render_view_host) {