cc: Remove all blimp code from cc.

cc/proto/client_state_update.proto

Index: cc/proto/client_state_update.proto
diff --git a/cc/proto/client_state_update.proto b/cc/proto/client_state_update.proto
deleted file mode 100644
index c1ae4908ff7b71a0f8878f5486081f28b891fcfe..0000000000000000000000000000000000000000
--- a/cc/proto/client_state_update.proto
+++ /dev/null
@@ -1,21 +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;
-
-import "vector2df.proto";
-
-package cc.proto;
-
-message ScrollUpdate {
-  optional int32 layer_id = 1;
-  optional Vector2dF scroll_delta = 2;
-}
-
-message ClientStateUpdate {
-  repeated ScrollUpdate scroll_updates = 1;
-  optional float page_scale_delta = 2;
-}