cc: Remove all blimp code from cc.

cc/proto/vector2d.proto

Index: cc/proto/vector2d.proto
diff --git a/cc/proto/vector2d.proto b/cc/proto/vector2d.proto
deleted file mode 100644
index 15171844ffc443d28cae7c70e2149ac3989200ab..0000000000000000000000000000000000000000
--- a/cc/proto/vector2d.proto
+++ /dev/null
@@ -1,14 +0,0 @@
-// 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 cc.proto;
-
-message Vector2d {
-  optional int64 x = 1;
-  optional int64 y = 2;
-}