Move all core files in //components/sessions into core/ subdir

components/sessions/sessions_export.h

Index: components/sessions/sessions_export.h
diff --git a/components/sessions/sessions_export.h b/components/sessions/sessions_export.h
deleted file mode 100644
index f307101a8f3931d89d237dfe12856dcca21f6616..0000000000000000000000000000000000000000
--- a/components/sessions/sessions_export.h
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright 2013 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 COMPONENTS_SESSIONS_SESSIONS_EXPORT_H_
-#define COMPONENTS_SESSIONS_SESSIONS_EXPORT_H_
-
-#if defined(COMPONENT_BUILD)
-#if defined(WIN32)
-
-#if defined(SESSIONS_IMPLEMENTATION)
-#define SESSIONS_EXPORT __declspec(dllexport)
-#define SESSIONS_EXPORT_PRIVATE __declspec(dllexport)
-#else
-#define SESSIONS_EXPORT __declspec(dllimport)
-#define SESSIONS_EXPORT_PRIVATE __declspec(dllimport)
-#endif  // defined(SESSIONS_IMPLEMENTATION)
-
-#else  // defined(WIN32)
-#if defined(SESSIONS_IMPLEMENTATION)
-#define SESSIONS_EXPORT __attribute__((visibility("default")))
-#define SESSIONS_EXPORT_PRIVATE __attribute__((visibility("default")))
-#else
-#define SESSIONS_EXPORT
-#define SESSIONS_EXPORT_PRIVATE
-#endif
-#endif
-
-#else  // defined(COMPONENT_BUILD)
-#define SESSIONS_EXPORT
-#define SESSIONS_EXPORT_PRIVATE
-#endif
-
-#endif  // COMPONENTS_SESSIONS_SESSIONS_EXPORT_H_