Make MetricsService upload logs through an interface.

components/metrics/net/compression_utils.cc

Index: components/metrics/net/compression_utils.cc
===================================================================
--- components/metrics/net/compression_utils.cc	(working copy)
+++ components/metrics/net/compression_utils.cc	(working copy)
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/metrics/compression_utils.h"
+#include "components/metrics/net/compression_utils.h"
 
 #include <vector>
 
@@ -70,9 +70,10 @@
     err = deflateEnd(&stream);
     return err;
 }
+
 }  // namespace
 
-namespace chrome {
+namespace metrics {
 
 bool GzipCompress(const std::string& input, std::string* output) {
   std::vector<Bytef> compressed_data(kGzipZlibHeaderDifferenceBytes +
@@ -89,4 +90,5 @@
   output->assign(compressed_data.begin(), compressed_data.end());
   return true;
 }
-}  // namespace chrome
+
+}  // namespace metrics