Revert of Allow top-level navigation in extension pop-ups if it only triggers a download.

chrome/browser/extensions/extension_view_host.cc

Index: chrome/browser/extensions/extension_view_host.cc
diff --git a/chrome/browser/extensions/extension_view_host.cc b/chrome/browser/extensions/extension_view_host.cc
index ea544c71fd365928d990663cee02277bf889e04e..615e13cd8abf6e28db278d05fbf2ccec1f60db9e 100644
--- a/chrome/browser/extensions/extension_view_host.cc
+++ b/chrome/browser/extensions/extension_view_host.cc
@@ -165,14 +165,6 @@
   }
 }
 
-bool ExtensionViewHost::ShouldTransferNavigation(
-    bool is_main_frame_navigation) {
-  // Block navigations that cause main frame of an extension pop-up (or
-  // background page) to navigate to non-extension content (i.e. to web
-  // content).
-  return !is_main_frame_navigation;
-}
-
 bool ExtensionViewHost::PreHandleKeyboardEvent(
     WebContents* source,
     const NativeWebKeyboardEvent& event,