Move chromeos::device_event_log into components.

components/device_event_log/BUILD.gn

Index: components/device_event_log/BUILD.gn
diff --git a/components/device_event_log/BUILD.gn b/components/device_event_log/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..0b1103b2f1e4da51721820f61287ce17a7acd4e3
--- /dev/null
+++ b/components/device_event_log/BUILD.gn
@@ -0,0 +1,29 @@
+# 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("device_event_log") {
+  sources = [
+    "device_event_log.cc",
+    "device_event_log.h",
+    "device_event_log_impl.cc",
+    "device_event_log_impl.h",
+  ]
+
+  deps = [
+    "//base",
+    "//net",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "device_event_log_impl_unittest.cc",
+  ]
+
+  deps = [
+    ":device_event_log",
+    "//testing/gtest",
+  ]
+}