[Extensions] Clean up renderer channel-related code

chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc

Index: chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc
diff --git a/chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc b/chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc
index a018de7729d9f8a7265883ef2d7264207d8b435c..cd751d916c7cea6828d9267c75883ec7f76a893d 100644
--- a/chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc
+++ b/chrome/renderer/extensions/chrome_extensions_dispatcher_delegate.cc
@@ -12,7 +12,6 @@
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/crash_keys.h"
-#include "chrome/common/extensions/features/feature_util.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/renderer_resources.h"
 #include "chrome/renderer/extensions/app_bindings.h"
@@ -280,12 +279,3 @@ void ChromeExtensionsDispatcherDelegate::OnActiveExtensionsUpdated(
     return;
   crash_keys::SetActiveExtensions(extension_ids);
 }
-
-void ChromeExtensionsDispatcherDelegate::SetChannel(int channel) {
-  extensions::SetCurrentChannel(static_cast<version_info::Channel>(channel));
-  if (extensions::feature_util::ExtensionServiceWorkersEnabled()) {
-    // chrome-extension: resources should be allowed to register ServiceWorkers.
-    blink::WebSecurityPolicy::registerURLSchemeAsAllowingServiceWorkers(
-        blink::WebString::fromUTF8(extensions::kExtensionScheme));
-  }
-}