Move chromeos::device_event_log into components.

components/device_event_log.gypi

+# 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'device_event_log_component',
+      'type': '<(component)',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../net/net.gyp:net',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'defines': [
+        'DEVICE_EVENT_LOG_IMPLEMENTATION',
+      ],
+      'sources': [
+        'device_event_log/device_event_log.cc',
+        'device_event_log/device_event_log.h',
+        'device_event_log/device_event_log_impl.cc',
+        'device_event_log/device_event_log_impl.h',
+      ],
+    },
+  ],
+}