Remove parts of //cc we aren't using

cc/output/latency_info_swap_promise.h

Index: cc/output/latency_info_swap_promise.h
diff --git a/cc/output/latency_info_swap_promise.h b/cc/output/latency_info_swap_promise.h
deleted file mode 100644
index afd16332a5ea6afd57638eacb4a4e5686c6173e7..0000000000000000000000000000000000000000
--- a/cc/output/latency_info_swap_promise.h
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2013 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_OUTPUT_LATENCY_INFO_SWAP_PROMISE_H_
-#define CC_OUTPUT_LATENCY_INFO_SWAP_PROMISE_H_
-
-#include "base/compiler_specific.h"
-#include "cc/output/swap_promise.h"
-#include "ui/events/latency_info.h"
-
-namespace cc {
-
-class CC_EXPORT LatencyInfoSwapPromise : public SwapPromise {
- public:
-  explicit LatencyInfoSwapPromise(const ui::LatencyInfo& latency_info);
-  ~LatencyInfoSwapPromise() override;
-
-  void DidSwap(CompositorFrameMetadata* metadata) override;
-  void DidNotSwap(DidNotSwapReason reason) override;
-
-  int64 TraceId() const override;
-
- private:
-  ui::LatencyInfo latency_;
-};
-
-}  // namespace cc
-
-#endif  // CC_OUTPUT_LATENCY_INFO_SWAP_PROMISE_H_