Move device/core files to device/base directory.

device/base/device_base_export.h

Index: device/base/device_base_export.h
diff --git a/device/base/device_base_export.h b/device/base/device_base_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..f896ea85084c57d6e9de2112ff1a07198da945dc
--- /dev/null
+++ b/device/base/device_base_export.h
@@ -0,0 +1,28 @@
+// 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.
+
+#ifndef DEVICE_BASE_DEVICE_BASE_EXPORT_H_
+#define DEVICE_BASE_DEVICE_BASE_EXPORT_H_
+
+#if defined(COMPONENT_BUILD) && defined(WIN32)
+
+#if defined(DEVICE_BASE_IMPLEMENTATION)
+#define DEVICE_BASE_EXPORT __declspec(dllexport)
+#else
+#define DEVICE_BASE_EXPORT __declspec(dllimport)
+#endif
+
+#elif defined(COMPONENT_BUILD) && !defined(WIN32)
+
+#if defined(DEVICE_BASE_IMPLEMENTATION)
+#define DEVICE_BASE_EXPORT __attribute__((visibility("default")))
+#else
+#define DEVICE_BASE_EXPORT
+#endif
+
+#else
+#define DEVICE_BASE_EXPORT
+#endif
+
+#endif  // DEVICE_BASE_DEVICE_BASE_EXPORT_H_