Make MetricsService save compressed logs to local state.

components/metrics/net/compression_utils.h

Index: components/metrics/net/compression_utils.h
===================================================================
--- components/metrics/net/compression_utils.h	(revision 276253)
+++ components/metrics/net/compression_utils.h	(working copy)
@@ -1,17 +0,0 @@
-// Copyright 2014 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 COMPONENTS_METRICS_NET_COMPRESSION_UTILS_H_
-#define COMPONENTS_METRICS_NET_COMPRESSION_UTILS_H_
-
-#include <string>
-
-namespace metrics {
-
-// Compresses the text in |input| using gzip, storing the result in |output|.
-bool GzipCompress(const std::string& input, std::string* output);
-
-}  // namespace metrics
-
-#endif  // COMPONENTS_METRICS_NET_COMPRESSION_UTILS_H_