Revert of Encapsulate CSS selector declarative content condition tracking

chrome/browser/extensions/tab_helper.cc

Index: chrome/browser/extensions/tab_helper.cc
diff --git a/chrome/browser/extensions/tab_helper.cc b/chrome/browser/extensions/tab_helper.cc
index 0052793c67107ac93bb63d3623da390b703f2f4a..e3c8c445b4538040338e0298e249db3e094ea483 100644
--- a/chrome/browser/extensions/tab_helper.cc
+++ b/chrome/browser/extensions/tab_helper.cc
@@ -263,6 +263,8 @@
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_Request, OnRequest)
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_ContentScriptsExecuting,
                         OnContentScriptsExecuting)
+    IPC_MESSAGE_HANDLER(ExtensionHostMsg_OnWatchedPageChange,
+                        OnWatchedPageChange)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -430,6 +432,15 @@
       OnScriptsExecuted(web_contents(), executing_scripts_map, on_url));
 }
 
+void TabHelper::OnWatchedPageChange(
+    const std::vector<std::string>& css_selectors) {
+  if (ExtensionSystem::Get(profile_)->extension_service() &&
+      RulesRegistryService::Get(profile_)) {
+    RulesRegistryService::Get(profile_)->content_rules_registry()->Apply(
+        web_contents(), css_selectors);
+  }
+}
+
 void TabHelper::OnDetailedConsoleMessageAdded(
     const base::string16& message,
     const base::string16& source,