Remove all //blimp code.

blimp/common/proto/tab_control.proto

-// Copyright 2015 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.
-//
-// Message definitions for browser tab control messages.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-import "common.proto";
-
-package blimp;
-
-// Contains display information that represents resize events coming from the
-// client device.
-message SizeMessage {
-  optional uint64 width = 1;
-  optional uint64 height = 2;
-  optional float device_pixel_ratio = 3;
-}
-
-message TabControlMessage {
-  // Feature-specific messages follow.
-  oneof tab_control {
-    // Client <=> Server types.
-    EmptyMessage create_tab = 40;
-    EmptyMessage close_tab = 41;
-
-    // Client => Server types.
-    SizeMessage size = 42;
-  }
-}