views: Move box_layout.[cc,h] into the new layout directory.

views/views.gyp

Index: views/views.gyp
diff --git a/views/views.gyp b/views/views.gyp
index 34013a6881107e7ce32f00a596cbadc0b3c32f4b..b3ab405e48f20b0beeace7c9ac244a832d1b9f12 100644
--- a/views/views.gyp
+++ b/views/views.gyp
@@ -82,8 +82,6 @@
         'background.h',
         'border.cc',
         'border.h',
-        'box_layout.h',
-        'box_layout.cc',
         'controls/button/button.cc',
         'controls/button/button.h',
         'controls/button/button_dropdown.cc',
@@ -285,6 +283,8 @@
         'grid_layout.h',
         'layout_manager.cc',
         'layout_manager.h',
+        'layout/box_layout.cc',
+        'layout/box_layout.h',
         'mouse_watcher.cc',
         'mouse_watcher.h',
         'painter.cc',
@@ -452,7 +452,6 @@
       ],
       'sources': [
         'animation/bounds_animator_unittest.cc',
-        'box_layout_unittest.cc',
         'controls/label_unittest.cc',
         'controls/progress_bar_unittest.cc',
         'controls/single_split_view_unittest.cc',
@@ -463,6 +462,7 @@
         'focus/accelerator_handler_gtk_unittest.cc',
         'focus/focus_manager_unittest.cc',
         'grid_layout_unittest.cc',
+        'layout/box_layout_unittest.cc',
         'test/views_test_base.h',
         'run_all_unittests.cc',
         'test/test_views_delegate.h',