Allow content script insertion on about:-URLs.

extensions/renderer/user_script_slave.cc

Index: extensions/renderer/user_script_slave.cc
diff --git a/extensions/renderer/user_script_slave.cc b/extensions/renderer/user_script_slave.cc
index f05d214799a264c3cefc665c90571b9351abf7ee..8e176effe205d75e42ad0e988e02f405dfc450f6 100644
--- a/extensions/renderer/user_script_slave.cc
+++ b/extensions/renderer/user_script_slave.cc
@@ -212,12 +212,15 @@ void UserScriptSlave::InjectScripts(WebFrame* frame,
     if (!extension)
       continue;
 
+    const GURL& document_url = ScriptContext::GetEffectiveDocumentURL(
+        frame, data_source_url, script->match_about_blank());
+
     // Content scripts are not tab-specific.
     const int kNoTabId = -1;
     // We don't have a process id in this context.
     const int kNoProcessId = -1;
     if (!PermissionsData::CanExecuteScriptOnPage(extension,
-                                                 data_source_url,
+                                                 document_url,
                                                  top_frame->document().url(),
                                                  kNoTabId,
                                                  script,