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

chrome/browser/debugger/devtools_window.cc

Index: chrome/browser/debugger/devtools_window.cc
===================================================================
--- chrome/browser/debugger/devtools_window.cc	(revision 154307)
+++ chrome/browser/debugger/devtools_window.cc	(working copy)
@@ -577,15 +577,16 @@
       ExecuteJavascriptInWebFrame(string16(), UTF8ToUTF16(command));
 }
 
-void DevToolsWindow::AddNewContents(WebContents* source,
+bool DevToolsWindow::AddNewContents(WebContents* source,
                                     WebContents* new_contents,
                                     WindowOpenDisposition disposition,
                                     const gfx::Rect& initial_pos,
                                     bool user_gesture) {
   if (inspected_tab_) {
-    inspected_tab_->web_contents()->GetDelegate()->AddNewContents(
+    return inspected_tab_->web_contents()->GetDelegate()->AddNewContents(
         source, new_contents, disposition, initial_pos, user_gesture);
   }
+  return true;
 }
 
 bool DevToolsWindow::PreHandleKeyboardEvent(