cc: Remove all blimp code from cc.

cc/proto/layer_tree.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.
-
-syntax = "proto2";
-
-package cc.proto;
-
-import "layer.proto";
-import "layer_selection_bound.proto";
-import "size.proto";
-import "vector2df.proto";
-
-option optimize_for = LITE_RUNTIME;
-
-message LayerTree {
-  optional LayerNode root_layer = 27;
-  optional int32 overscroll_elasticity_layer_id = 3;
-  optional int32 page_scale_layer_id = 4;
-  optional int32 inner_viewport_scroll_layer_id = 5;
-  optional int32 outer_viewport_scroll_layer_id = 6;
-
-  // Browser Controls ignored. They are not supported.
-
-  optional float device_scale_factor = 13;
-  optional float painted_device_scale_factor = 14;
-  optional float page_scale_factor = 15;
-  optional float min_page_scale_factor = 16;
-  optional float max_page_scale_factor = 17;
-
-  // TODO(khushalsagar): gfx::ColorSpace?
-
-  optional uint32 background_color = 21; /* SkColor */
-  optional bool has_transparent_background = 22;
-
-  optional LayerSelection selection = 29;
-  optional Size device_viewport_size = 18;
-
-  // TODO(khushalsagar): Do we actually care about these?
-  optional bool have_scroll_event_handlers = 23;
-  optional uint32 touch_start_or_move_event_listener_properties = 24;
-  optional uint32 wheel_event_listener_properties = 25;
-  optional uint32 touch_end_or_cancel_event_listener_properties = 26;
-}