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

components/sessions.gypi

Index: components/sessions.gypi
diff --git a/components/sessions.gypi b/components/sessions.gypi
index fc739d2395de1bbb8c5ed379bb6cb0a245490255..eb1a9d3c69d7f024c418f1d0247add37fbe1be3b 100644
--- a/components/sessions.gypi
+++ b/components/sessions.gypi
@@ -8,18 +8,30 @@
     # be a separate shared library since one symbol is implemented higher up in
     # the sessions_content/ios layer.
     'sessions_core_sources': [
-      'sessions/base_session_service.cc',
-      'sessions/base_session_service.h',
-      'sessions/base_session_service_commands.cc',
-      'sessions/base_session_service_commands.h',
-      'sessions/base_session_service_delegate.h',
+      'sessions/core/base_session_service.cc',
+      'sessions/core/base_session_service.h',
+      'sessions/core/base_session_service_commands.cc',
+      'sessions/core/base_session_service_commands.h',
+      'sessions/core/base_session_service_delegate.h',
       'sessions/core/live_tab.cc',
       'sessions/core/live_tab.h',
       'sessions/core/persistent_tab_restore_service.cc',
       'sessions/core/persistent_tab_restore_service.h',
       'sessions/core/serialized_navigation_driver.h',
+      'sessions/core/serialized_navigation_entry.cc',
+      'sessions/core/serialized_navigation_entry.h',
+      'sessions/core/session_backend.cc',
+      'sessions/core/session_backend.h',
+      'sessions/core/session_command.cc',
+      'sessions/core/session_command.h',
       'sessions/core/session_constants.cc',
       'sessions/core/session_constants.h',
+      'sessions/core/session_id.cc',
+      'sessions/core/session_id.h',
+      'sessions/core/session_service_commands.cc',
+      'sessions/core/session_service_commands.h',
+      'sessions/core/session_types.cc',
+      'sessions/core/session_types.h',
       'sessions/core/tab_restore_service.cc',
       'sessions/core/tab_restore_service.h',
       'sessions/core/tab_restore_service_client.cc',
@@ -28,18 +40,6 @@
       'sessions/core/tab_restore_service_helper.cc',
       'sessions/core/tab_restore_service_helper.h',
       'sessions/core/tab_restore_service_observer.h',
-      'sessions/serialized_navigation_entry.cc',
-      'sessions/serialized_navigation_entry.h',
-      'sessions/session_backend.cc',
-      'sessions/session_backend.h',
-      'sessions/session_command.cc',
-      'sessions/session_command.h',
-      'sessions/session_id.cc',
-      'sessions/session_id.h',
-      'sessions/session_service_commands.cc',
-      'sessions/session_service_commands.h',
-      'sessions/session_types.cc',
-      'sessions/session_types.h',
     ],
   },
   'targets': [
@@ -57,14 +57,14 @@
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
-        'sessions/serialized_navigation_entry_test_helper.cc',
-        'sessions/serialized_navigation_entry_test_helper.h',
+        'sessions/core/serialized_navigation_entry_test_helper.cc',
+        'sessions/core/serialized_navigation_entry_test_helper.h',
       ],
       'conditions': [
         ['OS!="ios" and OS!="android"', {
           'sources': [
-            'sessions/base_session_service_test_helper.cc',
-            'sessions/base_session_service_test_helper.h',
+            'sessions/core/base_session_service_test_helper.cc',
+            'sessions/core/base_session_service_test_helper.h',
            ],
         }],
       ],