Remove all //blimp code.

blimp/common/proto/settings.proto

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-package blimp;
-
-// This includes any settings/flags that can be set on the client or the engine.
-message SettingsMessage {
-  optional EngineSettingsMessage engine_settings = 1;
-}
-
-// Client ==> Engine Settings
-message EngineSettingsMessage {
-  // -----------------------Web Preferences----------------------
-  optional bool record_whole_document = 1;
-
-  // For building user agent
-  optional string client_os_info = 2;
-}