Extensions: Only create Web request rules registry if Declarative Web Request is enabled.

extensions/common/features/simple_feature.cc

Index: extensions/common/features/simple_feature.cc
diff --git a/extensions/common/features/simple_feature.cc b/extensions/common/features/simple_feature.cc
index d901cd9a70cb765eb6e0abd76ff46fab218bc7c5..0f7675b19f15c504bd5caa3c6409e6bc48fea78d 100644
--- a/extensions/common/features/simple_feature.cc
+++ b/extensions/common/features/simple_feature.cc
@@ -53,6 +53,11 @@ Feature::Availability IsAvailableToContextForBind(const Extension* extension,
   return feature->IsAvailableToContext(extension, context, url, platform);
 }
 
+Feature::Availability IsAvailableToChannelForBind(version_info::Channel channel,
+                                                  const Feature* feature) {
+  return feature->IsAvailableToChannel(channel);
+}
+
 // Gets a human-readable name for the given extension type, suitable for giving
 // to developers in an error message.
 std::string GetDisplayName(Manifest::Type type) {
@@ -455,6 +460,13 @@ bool SimpleFeature::IsIdInWhitelist(const std::string& extension_id) const {
   return IsIdInList(extension_id, whitelist_);
 }
 
+Feature::Availability SimpleFeature::IsAvailableToChannel(
+    version_info::Channel channel) const {
+  if (channel_ && *channel_ < channel)
+    return CreateAvailability(UNSUPPORTED_CHANNEL, *channel_);
+  return CheckDependencies(base::Bind(&IsAvailableToChannelForBind, channel));
+}
+
 // static
 bool SimpleFeature::IsIdInArray(const std::string& extension_id,
                                 const char* const array[],