Move remaining Blimp feature code to core.

blimp/client/core/settings/settings_feature.h

Index: blimp/client/core/settings/settings_feature.h
diff --git a/blimp/client/feature/settings_feature.h b/blimp/client/core/settings/settings_feature.h
similarity index 88%
rename from blimp/client/feature/settings_feature.h
rename to blimp/client/core/settings/settings_feature.h
index 58c50f5d2c96e97919026b343a4a31ad251c861f..18682822cb3fb77c2a27b560241bc27871df23ee 100644
--- a/blimp/client/feature/settings_feature.h
+++ b/blimp/client/core/settings/settings_feature.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef BLIMP_CLIENT_FEATURE_SETTINGS_FEATURE_H_
-#define BLIMP_CLIENT_FEATURE_SETTINGS_FEATURE_H_
+#ifndef BLIMP_CLIENT_CORE_SETTINGS_SETTINGS_FEATURE_H_
+#define BLIMP_CLIENT_CORE_SETTINGS_SETTINGS_FEATURE_H_
 
 #include "base/macros.h"
 #include "blimp/net/blimp_message_processor.h"
@@ -42,4 +42,4 @@ class SettingsFeature : public BlimpMessageProcessor {
 }  // namespace client
 }  // namespace blimp
 
-#endif  // BLIMP_CLIENT_FEATURE_SETTINGS_FEATURE_H_
+#endif  // BLIMP_CLIENT_CORE_SETTINGS_SETTINGS_FEATURE_H_