Move //components/metrics/compression_utils into standalone component

components/compression/BUILD.gn

 # 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.
 
-source_set("logging") {
+# GYP version: components/compression.gypi:compression
+source_set("compression") {
   sources = [
-    "log_buffer.cc",
-    "log_buffer.h",
-    "logging.cc",
-    "logging.h",
+    "compression_utils.cc",
+    "compression_utils.h",
   ]
-
   deps = [
     "//base",
+    "//third_party/zlib",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
-    "logging_unittest.cc",
+    "compression_utils_unittest.cc",
   ]
-
   deps = [
-    "//base/test:test_support",
+    ":compression",
     "//testing/gtest",
   ]
 }