Allow content script insertion on about:-URLs.

chrome/renderer/extensions/user_script_slave.h

Index: chrome/renderer/extensions/user_script_slave.h
diff --git a/chrome/renderer/extensions/user_script_slave.h b/chrome/renderer/extensions/user_script_slave.h
index a538014c06fc2075d3f874966e2fe18b205f9f93..a3835df38ee3c89af572333c3d051aab6f5c4806 100644
--- a/chrome/renderer/extensions/user_script_slave.h
+++ b/chrome/renderer/extensions/user_script_slave.h
@@ -36,6 +36,13 @@ class UserScriptSlave {
   // committed, this is the commited URL. Otherwise it is the provisional URL.
   static GURL GetDataSourceURLForFrame(const blink::WebFrame* frame);
 
+  // Returns the first non-about:-URL in the document hierarchy above and
+  // including |frame|. The document hierarchy is only traversed if
+  // |document_url| is an about:-URL and if |match_about_blank| is true.
+  static GURL GetEffectiveDocumentURL(const blink::WebFrame* frame,
+                                      const GURL& document_url,
+                                      bool match_about_blank);
+
   explicit UserScriptSlave(const ExtensionSet* extensions);
   ~UserScriptSlave();