Service CreateNewWindow on the UI thread with a new mojo interface

content/browser/renderer_host/DEPS

 include_rules = [
   "+cc/switches.h", # For cc command line switches.
   "+components/display_compositor",
   "+components/variations",
   "+services/ui/public",
   "+third_party/zlib",
   "+ui/latency",
 
   # The renderer_host files should only call upwards in the layering via the
   # delegate interfaces.
@@ skipping 21 matching lines @@
   ],
   "ime_adapter_android\.cc": [
     "+content/browser/frame_host",
     "+content/public/browser/web_contents.h",
   ],
   # TODO(nasko): Remove these exceptions once we've untangled the dependency
   # of RenderViewHost on the FrameTree.
   "render_view_host_impl\.(cc|h)": [
     "+content/browser/frame_host/frame_tree.h",
   ],
-  "render_widget_helper\.cc": [
-    # RenderWidgetHelper is involved in RenderFrameHost creation.
-    "+content/browser/frame_host/render_frame_host_impl.h",
-  ],
   "render_widget_host_view_aura\.cc": [
     "+content/browser/frame_host",
   ],
   "render_widget_host_view_event_handler\.cc": [
     "+content/browser/frame_host",
   ],
   # TODO(kenrb): RenderWidgetHostViewChildFrame should eventually be moved
   # to content/renderer_host, at which time this can be removed.
   # RenderWidgetHostViewGuest dependency is needed to allow for routing mouse
   # events to the correct owner RenderWidgetHostViewBase. It should be removed
   # when all inner WebContents are based on OOPIF structure (as opposed to
   # BrowserPlugin).
   "render_widget_host_input_event_router.cc": [
     "+content/browser/frame_host/render_widget_host_view_child_frame.h",
     "+content/browser/frame_host/render_widget_host_view_guest.h",
   ],
 }