Fix webrequest api for webview in webui

extensions/browser/extension_function.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_
 #define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_
 
 #include <list>
 #include <string>
 
@@ skipping 200 matching lines @@
   const std::string& name() const { return name_; }
 
   void set_profile_id(void* profile_id) { profile_id_ = profile_id; }
   void* profile_id() const { return profile_id_; }
 
   void set_extension(
       const scoped_refptr<const extensions::Extension>& extension) {
     extension_ = extension;
   }
   const extensions::Extension* extension() const { return extension_.get(); }
-  const std::string& extension_id() const { return extension_->id(); }
+  const std::string& extension_id() const {
+    DCHECK(extension())
+        << "extension_id() called without an Extension. If " << name()
+        << " is allowed to be called without any Extension then you should "
+        << "check extension() first. If not, there is a bug in the Extension "
+        << "platform, so page somebody in extensions/OWNERS";
+    return extension_->id();
+  }
 
   void set_request_id(int request_id) { request_id_ = request_id; }
   int request_id() { return request_id_; }
 
   void set_source_url(const GURL& source_url) { source_url_ = source_url; }
   const GURL& source_url() { return source_url_; }
 
   void set_has_callback(bool has_callback) { has_callback_ = has_callback; }
   bool has_callback() { return has_callback_; }
 
@@ skipping 374 matching lines @@
   virtual bool RunSync() = 0;
 
   // ValidationFailure override to match RunSync().
   static bool ValidationFailure(SyncIOThreadExtensionFunction* function);
 
  private:
   ResponseAction Run() override;
 };
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_