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

components/sessions/BUILD.gn

Index: components/sessions/BUILD.gn
diff --git a/components/sessions/BUILD.gn b/components/sessions/BUILD.gn
index ed2291e779b6fad6c646301f4a4ae79c62aaf0bb..b3296fb0cb504d7f965771d2684d2aafb8f6c9c4 100644
--- a/components/sessions/BUILD.gn
+++ b/components/sessions/BUILD.gn
@@ -63,16 +63,28 @@ source_set("shared") {
   visibility = [ ":*" ]
 
   sources = [
-    "base_session_service.cc",
-    "base_session_service.h",
-    "base_session_service_commands.cc",
-    "base_session_service_commands.h",
-    "base_session_service_delegate.h",
+    "core/base_session_service.cc",
+    "core/base_session_service.h",
+    "core/base_session_service_commands.cc",
+    "core/base_session_service_commands.h",
+    "core/base_session_service_delegate.h",
     "core/live_tab.cc",
     "core/live_tab.h",
     "core/serialized_navigation_driver.h",
+    "core/serialized_navigation_entry.cc",
+    "core/serialized_navigation_entry.h",
+    "core/session_backend.cc",
+    "core/session_backend.h",
+    "core/session_command.cc",
+    "core/session_command.h",
     "core/session_constants.cc",
     "core/session_constants.h",
+    "core/session_id.cc",
+    "core/session_id.h",
+    "core/session_service_commands.cc",
+    "core/session_service_commands.h",
+    "core/session_types.cc",
+    "core/session_types.h",
     "core/tab_restore_service.cc",
     "core/tab_restore_service.h",
     "core/tab_restore_service_client.cc",
@@ -81,18 +93,6 @@ source_set("shared") {
     "core/tab_restore_service_helper.cc",
     "core/tab_restore_service_helper.h",
     "core/tab_restore_service_observer.h",
-    "serialized_navigation_entry.cc",
-    "serialized_navigation_entry.h",
-    "session_backend.cc",
-    "session_backend.h",
-    "session_command.cc",
-    "session_command.h",
-    "session_id.cc",
-    "session_id.h",
-    "session_service_commands.cc",
-    "session_service_commands.h",
-    "session_types.cc",
-    "session_types.h",
   ]
 
   if (is_android) {
@@ -127,8 +127,8 @@ source_set("shared") {
 source_set("test_support") {
   testonly = true
   sources = [
-    "serialized_navigation_entry_test_helper.cc",
-    "serialized_navigation_entry_test_helper.h",
+    "core/serialized_navigation_entry_test_helper.cc",
+    "core/serialized_navigation_entry_test_helper.h",
   ]
 
   public_deps = [
@@ -142,8 +142,8 @@ source_set("test_support") {
 
   if (!is_android && !is_ios) {
     sources += [
-      "base_session_service_test_helper.cc",
-      "base_session_service_test_helper.h",
+      "core/base_session_service_test_helper.cc",
+      "core/base_session_service_test_helper.h",
     ]
   }
 }
@@ -154,11 +154,11 @@ if (!is_ios && !is_android) {
     sources = [
       "content/content_serialized_navigation_builder_unittest.cc",
       "content/content_serialized_navigation_driver_unittest.cc",
+      "core/serialized_navigation_entry_unittest.cc",
+      "core/session_backend_unittest.cc",
+      "core/session_types_unittest.cc",
       "ios/ios_serialized_navigation_builder_unittest.cc",
       "ios/ios_serialized_navigation_driver_unittest.cc",
-      "serialized_navigation_entry_unittest.cc",
-      "session_backend_unittest.cc",
-      "session_types_unittest.cc",
     ]
     deps = [
       ":sessions",