[Sync] Creating sync_sessions component, moving revisit logic.

components/sync_sessions/revisit/page_visit_observer.h

Index: components/sync_sessions/revisit/page_visit_observer.h
diff --git a/components/sync_driver/revisit/page_visit_observer.h b/components/sync_sessions/revisit/page_visit_observer.h
similarity index 73%
rename from components/sync_driver/revisit/page_visit_observer.h
rename to components/sync_sessions/revisit/page_visit_observer.h
index 8b364603c5e72d71f8cc37fb5844c6bd3f86ed0e..701f9a32cff041748e25ccd2adb74f20059e3d81 100644
--- a/components/sync_driver/revisit/page_visit_observer.h
+++ b/components/sync_sessions/revisit/page_visit_observer.h
@@ -2,12 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_SYNC_DRIVER_REVISIT_PAGE_VISIT_OBSERVERE_H_
-#define COMPONENTS_SYNC_DRIVER_REVISIT_PAGE_VISIT_OBSERVERE_H_
+#ifndef COMPONENTS_SYNC_SESSIONS_REVISIT_PAGE_VISIT_OBSERVER_H_
+#define COMPONENTS_SYNC_SESSIONS_REVISIT_PAGE_VISIT_OBSERVER_H_
 
-#include "url/gurl.h"
+#include <string>
 
-namespace sync_driver {
+#include "base/time/time.h"
+
+class GURL;
+
+namespace sync_sessions {
 
 // An interface that allows observers to be notified when a page is visited.
 class PageVisitObserver {
@@ -31,6 +35,6 @@ class PageVisitObserver {
                            const TransitionType transition) = 0;
 };
 
-}  // namespace sync_driver
+}  // namespace sync_sessions
 
-#endif  // COMPONENTS_SYNC_DRIVER_REVISIT_PAGE_VISIT_OBSERVERE_H_
+#endif  // COMPONENTS_SYNC_SESSIONS_REVISIT_PAGE_VISIT_OBSERVER_H_