Move small c/b/extensions classes into extensions namespace no.2

chrome/chrome_browser_extensions.gypi

Index: chrome/chrome_browser_extensions.gypi
diff --git a/chrome/chrome_browser_extensions.gypi b/chrome/chrome_browser_extensions.gypi
index 3ae454d515a8f8b2050b69b229e65e7ca5e4c35f..9b8b24946c61a4fc241ed740252df4925f3b0ce0 100644
--- a/chrome/chrome_browser_extensions.gypi
+++ b/chrome/chrome_browser_extensions.gypi
@@ -276,6 +276,8 @@
         'browser/extensions/crx_installer.cc',
         'browser/extensions/crx_installer.h',
         'browser/extensions/crx_installer_error.h',
+        'browser/extensions/data_deleter.cc',
+        'browser/extensions/data_deleter.h',
         'browser/extensions/default_apps.cc',
         'browser/extensions/default_apps.h',
         'browser/extensions/default_apps_trial.cc',
@@ -296,8 +298,6 @@
         'browser/extensions/extension_creator.h',
         'browser/extensions/extension_creator_filter.cc',
         'browser/extensions/extension_creator_filter.h',
-        'browser/extensions/extension_data_deleter.cc',
-        'browser/extensions/extension_data_deleter.h',
         'browser/extensions/extension_devtools_bridge.cc',
         'browser/extensions/extension_devtools_bridge.h',
         'browser/extensions/extension_devtools_events.cc',
@@ -348,8 +348,6 @@
         'browser/extensions/extension_keybinding_registry.h',
         'browser/extensions/extension_module.cc',
         'browser/extensions/extension_module.h',
-        'browser/extensions/extension_navigation_observer.cc',
-        'browser/extensions/extension_navigation_observer.h',
         'browser/extensions/extension_pref_store.cc',
         'browser/extensions/extension_pref_store.h',
         'browser/extensions/extension_pref_value_map.cc',
@@ -404,8 +402,6 @@
         'browser/extensions/extension_webkit_preferences.h',
         'browser/extensions/extensions_quota_service.cc',
         'browser/extensions/extensions_quota_service.h',
-        'browser/extensions/extensions_startup.cc',
-        'browser/extensions/extensions_startup.h',
         'browser/extensions/external_loader.cc',
         'browser/extensions/external_loader.h',
         'browser/extensions/external_policy_loader.cc',
@@ -436,6 +432,8 @@
         'browser/extensions/message_handler.h',
         'browser/extensions/message_service.cc',
         'browser/extensions/message_service.h',
+        'browser/extensions/navigation_observer.cc',
+        'browser/extensions/navigation_observer.h',
         'browser/extensions/pack_extension_job.cc',
         'browser/extensions/pack_extension_job.h',
         'browser/extensions/page_action_controller.cc',
@@ -486,6 +484,8 @@
         'browser/extensions/settings/weak_unlimited_settings_storage.h',
         'browser/extensions/shell_window_registry.cc',
         'browser/extensions/shell_window_registry.h',
+        'browser/extensions/startup_helper.cc',
+        'browser/extensions/startup_helper.h',
         'browser/extensions/state_store.cc',
         'browser/extensions/state_store.h',
         'browser/extensions/tab_helper.cc',