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

chrome/browser/ui/views/ash/panel_view_aura.cc

Index: chrome/browser/ui/views/ash/panel_view_aura.cc
===================================================================
--- chrome/browser/ui/views/ash/panel_view_aura.cc	(revision 154307)
+++ chrome/browser/ui/views/ash/panel_view_aura.cc	(working copy)
@@ -67,7 +67,7 @@
   virtual void HandleMouseDown() OVERRIDE;
   virtual void UpdatePreferredSize(content::WebContents* source,
                                    const gfx::Size& pref_size) OVERRIDE;
-  virtual void AddNewContents(content::WebContents* source,
+  virtual bool AddNewContents(content::WebContents* source,
                               content::WebContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
@@ -139,7 +139,7 @@
 // This handles launching a new page from within the panel.
 // TODO(stevenjb): Determine whether or not this is the desired/expected
 // behavior for panels.
-void PanelHost::AddNewContents(content::WebContents* source,
+bool PanelHost::AddNewContents(content::WebContents* source,
                                content::WebContents* new_contents,
                                WindowOpenDisposition disposition,
                                const gfx::Rect& initial_pos,
@@ -147,9 +147,10 @@
   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 PanelHost::RenderViewCreated(content::RenderViewHost* render_view_host) {