Remove all //blimp code.

blimp/common/proto/render_widget.proto

Index: blimp/common/proto/render_widget.proto
diff --git a/blimp/common/proto/render_widget.proto b/blimp/common/proto/render_widget.proto
deleted file mode 100644
index 1ff94e4f9e54b0a790941f63b81738fbeeb31e0e..0000000000000000000000000000000000000000
--- a/blimp/common/proto/render_widget.proto
+++ /dev/null
@@ -1,24 +0,0 @@
-// 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.
-//
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-package blimp;
-
-message RenderWidgetMessage {
-  enum Type {
-    UNKNOWN = 0;
-
-    // Engine => Client types.
-    INITIALIZE = 1;
-    CREATED = 2;
-    DELETED = 3;
-  }
-
-  optional Type type = 1 [default = UNKNOWN];
-  optional int32 render_widget_id = 2;
-}