cc: Remove all blimp code from cc.

cc/proto/cc_conversions.h

-// 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.
-
-#ifndef CC_PROTO_CC_CONVERSIONS_H_
-#define CC_PROTO_CC_CONVERSIONS_H_
-
-#include "cc/base/cc_export.h"
-#include "cc/input/scrollbar.h"
-#include "cc/proto/layer.pb.h"
-#include "cc/trees/clip_node.h"
-
-namespace cc {
-class Region;
-
-namespace proto {
-class Region;
-}  // namespace proto
-
-// TODO(dtrainor): Move these to a class and make them static
-// (crbug.com/548432).
-CC_EXPORT void RegionToProto(const Region& region, proto::Region* proto);
-CC_EXPORT Region RegionFromProto(const proto::Region& proto);
-
-// Conversion methods for ScrollbarOrientation.
-CC_EXPORT proto::SolidColorScrollbarLayerProperties::ScrollbarOrientation
-ScrollbarOrientationToProto(const ScrollbarOrientation& orientation);
-CC_EXPORT ScrollbarOrientation ScrollbarOrientationFromProto(
-    const proto::SolidColorScrollbarLayerProperties::ScrollbarOrientation&
-        proto);
-
-}  // namespace cc
-
-#endif  // CC_PROTO_CC_CONVERSIONS_H_