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

components/components_tests.gyp

Index: components/components_tests.gyp
diff --git a/components/components_tests.gyp b/components/components_tests.gyp
index 8401296ffdd72fe81f8921e73fd30c23b04b68d6..19a78aed80e47fec02dd3eaa6d030fe3197b25f2 100644
--- a/components/components_tests.gyp
+++ b/components/components_tests.gyp
@@ -319,9 +319,9 @@
     'memory_pressure_unittest_sources': [
       'memory_pressure/direct_memory_pressure_calculator_win_unittest.cc',
       'memory_pressure/filtered_memory_pressure_calculator_unittest.cc',
+      'memory_pressure/memory_pressure_stats_collector_unittest.cc',
       'memory_pressure/test_memory_pressure_calculator.cc',
       'memory_pressure/test_memory_pressure_calculator.h',
-      'memory_pressure/memory_pressure_stats_collector_unittest.cc',
     ],
     'metrics_unittest_sources': [
       'metrics/call_stack_profile_metrics_provider_unittest.cc',
@@ -511,7 +511,6 @@
       'proximity_auth/bluetooth_connection_finder_unittest.cc',
       'proximity_auth/bluetooth_connection_unittest.cc',
       'proximity_auth/bluetooth_throttler_impl_unittest.cc',
-      'proximity_auth/messenger_impl_unittest.cc',
       'proximity_auth/connection_unittest.cc',
       'proximity_auth/cryptauth/base64url_unittest.cc',
       'proximity_auth/cryptauth/cryptauth_access_token_fetcher_impl_unittest.cc',
@@ -527,6 +526,7 @@
       'proximity_auth/device_to_device_operations_unittest.cc',
       'proximity_auth/device_to_device_secure_context_unittest.cc',
       'proximity_auth/logging/logging_unittest.cc',
+      'proximity_auth/messenger_impl_unittest.cc',
       'proximity_auth/proximity_auth_system_unittest.cc',
       'proximity_auth/proximity_monitor_impl_unittest.cc',
       'proximity_auth/remote_device_life_cycle_impl_unittest.cc',
@@ -604,11 +604,11 @@
     'sessions_unittest_sources': [
       'sessions/content/content_serialized_navigation_builder_unittest.cc',
       'sessions/content/content_serialized_navigation_driver_unittest.cc',
+      'sessions/core/serialized_navigation_entry_unittest.cc',
+      'sessions/core/session_backend_unittest.cc',
+      'sessions/core/session_types_unittest.cc',
       'sessions/ios/ios_serialized_navigation_builder_unittest.cc',
       'sessions/ios/ios_serialized_navigation_driver_unittest.cc',
-      'sessions/serialized_navigation_entry_unittest.cc',
-      'sessions/session_backend_unittest.cc',
-      'sessions/session_types_unittest.cc',
     ],
     'signin_unittest_sources': [
       'signin/core/browser/account_tracker_service_unittest.cc',
@@ -715,6 +715,7 @@
       'variations/experiment_labels_unittest.cc',
       'variations/metrics_util_unittest.cc',
       'variations/net/variations_http_header_provider_unittest.cc',
+      'variations/service/variations_service_unittest.cc',
       'variations/study_filtering_unittest.cc',
       'variations/variations_associated_data_unittest.cc',
       'variations/variations_request_scheduler_mobile_unittest.cc',
@@ -722,7 +723,6 @@
       'variations/variations_seed_processor_unittest.cc',
       'variations/variations_seed_simulator_unittest.cc',
       'variations/variations_seed_store_unittest.cc',
-      'variations/service/variations_service_unittest.cc',
     ],
     'visitedlink_unittest_sources': [
       'visitedlink/test/visitedlink_unittest.cc',
@@ -1229,7 +1229,7 @@
             'gcm_driver/gcm_driver_desktop_unittest.cc',
             'gcm_driver/gcm_stats_recorder_impl_unittest.cc',
             'gcm_driver/instance_id/instance_id_driver_unittest.cc',
-            'sessions/session_backend_unittest.cc',
+            'sessions/core/session_backend_unittest.cc',
             'storage_monitor/media_storage_util_unittest.cc',
             'storage_monitor/storage_info_unittest.cc',
             'storage_monitor/storage_monitor_unittest.cc',