Encapsulate CSS selector declarative content condition tracking

chrome/browser/extensions/tab_helper.h

Index: chrome/browser/extensions/tab_helper.h
diff --git a/chrome/browser/extensions/tab_helper.h b/chrome/browser/extensions/tab_helper.h
index 3fe25e2ec4918b204d3dd9584108fc54679c612a..5740898fb9074aa8d48255bd0ebb1bace84a6650 100644
--- a/chrome/browser/extensions/tab_helper.h
+++ b/chrome/browser/extensions/tab_helper.h
@@ -7,7 +7,6 @@
 
 #include <set>
 #include <string>
-#include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ -171,7 +170,6 @@ class TabHelper : public content::WebContentsObserver,
   void OnContentScriptsExecuting(
       const ScriptExecutionObserver::ExecutingScriptsMap& extension_ids,
       const GURL& on_url);
-  void OnWatchedPageChange(const std::vector<std::string>& css_selectors);
   void OnDetailedConsoleMessageAdded(const base::string16& message,
                                      const base::string16& source,
                                      const StackTrace& stack_trace,