[FIX] web: fix layout issue in Chrome 50 (again)

Makes the fix in f992c8e
specific to the view manager of the main oe_application
container, in order to avoid disrupting other view manager
occurrences (such as the ones in modal windows or x2many
list views).

Fixes #11629 (again)

Note: Hopefully the Blink team will fix Chrome so we can
get rid of this hack in the future:
  https://bugs.chromium.org/p/chromium/issues/detail?id=603507

addons/web/static/src/css/chrome50.css

@@ -3,6 +3,6 @@
   display: table-cell;
 }
 
-.oe_view_manager > .oe_view_manager_wrapper > div {
+.openerp .oe_application > div > .oe_view_manager > .oe_view_manager_wrapper > div {
   display: table-cell;
 }