Move all components/offline_pages/ files into component/offline_pages/core

components/offline_pages/core/client_namespace_constants.h

Index: components/offline_pages/core/client_namespace_constants.h
diff --git a/components/offline_pages/client_namespace_constants.h b/components/offline_pages/core/client_namespace_constants.h
similarity index 77%
rename from components/offline_pages/client_namespace_constants.h
rename to components/offline_pages/core/client_namespace_constants.h
index 823af09cc00e77a5d98fd11514972ec629b5c199..7991a5117921856fd47f30c6812f64187ef3f449 100644
--- a/components/offline_pages/client_namespace_constants.h
+++ b/components/offline_pages/core/client_namespace_constants.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_OFFLINE_PAGES_CLIENT_NAMESPACE_CONSTANTS_H_
-#define COMPONENTS_OFFLINE_PAGES_CLIENT_NAMESPACE_CONSTANTS_H_
+#ifndef COMPONENTS_OFFLINE_PAGES_CORE_CLIENT_NAMESPACE_CONSTANTS_H_
+#define COMPONENTS_OFFLINE_PAGES_CORE_CLIENT_NAMESPACE_CONSTANTS_H_
 
 #include "build/build_config.h"
 
@@ -23,4 +23,4 @@ extern const char kDefaultNamespace[];
 
 }  // namespace offline_pages
 
-#endif  // COMPONENTS_OFFLINE_PAGES_CLIENT_NAMESPACE_CONSTANTS_H_
+#endif  // COMPONENTS_OFFLINE_PAGES_CORE_CLIENT_NAMESPACE_CONSTANTS_H_