Move Mus into chrome's process when running with --mus.

chrome/browser/DEPS

 include_rules = [
   "+apps",
   "+cc/paint",
   "+chrome/app",
   "+chrome/chrome_watcher",
   "+chrome/grit",
   "+chrome/install_static",
   "+chrome/installer/util",
   "+chrome_elf/blacklist",
   "+chrome_elf/chrome_elf_constants.h",
@@ skipping 35 matching lines @@
   "+sandbox/win/src",  # The path doesn't say it, but this is the Windows sandbox.
   "+services/data_decoder/public/cpp",
   "+services/device/public/cpp/device_features.h",
   "+services/identity/public",
   "+services/preferences/public/cpp",
   "+services/preferences/public/interfaces",
   "+services/resource_coordinator/public/cpp",
   "+services/resource_coordinator/public/interfaces/memory_instrumentation",
   "+services/service_manager",
   "+services/shape_detection/public/interfaces",
+  "+services/ui",
   "+services/ui/public",
   "+skia/ext",
   "+third_party/boringssl/src/include",
   "+third_party/crashpad",
   "+third_party/cros_system_api",
 
   # Code under //ash runs out-of-process under mustash (chrome --mash) so it
   # must be accessed via mojo interfaces in //ash/public/interfaces. See
   # //ash/README.md.
   "-ash",
@@ skipping 69 matching lines @@
   "+third_party/WebKit/public/web/WebTextDirection.h",
   "+third_party/WebKit/public/web/window_features.mojom.h",
 ]
 specific_include_rules = {
   # TODO(mash): Remove. http://crbug.com/678705
   "fullscreen_chromeos\.cc": [
     "+ash/root_window_controller.h",
     "+ash/shell.h",
   ]
 }