Introduce a layering in the invalidation component as public and impl

components/invalidation/invalidation_logger_observer.h

Index: components/invalidation/invalidation_logger_observer.h
diff --git a/components/invalidation/invalidation_logger_observer.h b/components/invalidation/invalidation_logger_observer.h
index d754b93dbfcf261be0ee851824ffb8777059b5b8..5fb59f876a284df9e67fb9782dbfee93cc575846 100644
--- a/components/invalidation/invalidation_logger_observer.h
+++ b/components/invalidation/invalidation_logger_observer.h
@@ -6,9 +6,9 @@
 #define COMPONENTS_INVALIDATION_INVALIDATION_LOGGER_OBSERVER_H_
 
 #include "base/memory/scoped_ptr.h"
-#include "components/invalidation/invalidation_util.h"
-#include "components/invalidation/invalidator_state.h"
-#include "components/invalidation/object_id_invalidation_map.h"
+#include "components/invalidation/base/invalidation_util.h"
+#include "components/invalidation/base/invalidator_state.h"
+#include "components/invalidation/base/object_id_invalidation_map.h"
 
 namespace base {
 class DictionaryValue;