[DevTools] Remove dock side knowledge from browser.

chrome/browser/devtools/devtools_toggle_action.cc

 // 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.
 
 #include "chrome/browser/devtools/devtools_toggle_action.h"
 
 DevToolsToggleAction::RevealParams::RevealParams(const base::string16& url,
                                                  size_t line_number,
                                                  size_t column_number)
     : url(url), line_number(line_number), column_number(column_number) {
@@ skipping 44 matching lines @@
 }
 
 // static
 DevToolsToggleAction DevToolsToggleAction::Reveal(
     const base::string16& url,
     size_t line_number,
     size_t column_number) {
   return DevToolsToggleAction(
       new RevealParams(url, line_number, column_number));
 }
+
+// static
+DevToolsToggleAction DevToolsToggleAction::Nothing() {
+  return DevToolsToggleAction(kNothing);
+}