mus: Initialize WindowManagerConnection in chrome instead of in content.

content/browser/DEPS

 include_rules = [
   # Allow inclusion of specific components that we depend on. We may only
   # depend on components which we share with the mojo html_viewer.
   "+components/filesystem",
   "+components/leveldb",
   "+components/link_header_util",
   "+components/mime_util",
   "+components/mus/public/interfaces",
   "+components/mus/public",
   "+components/network_session_configurator/switches.h",
   "+components/profile_service",
   "+components/scheduler/common",
   "+components/tracing",
   "+components/url_formatter",
 
   "+content/app/strings/grit",  # For generated headers
   "+content/public/browser",
   "+device/battery",  # For battery status service.
   "+device/vibration",  # For Vibration API
   "+device/vr",  # For WebVR API
   "+gin/v8_initializer.h",
   "+mojo",
   "+services",
   "+sql",
   "+ui/aura_extra",
-  "+ui/views/mus",  # http://crbug.com/555767
   "+ui/webui",
   "+win8/util",
 
   # In general, //content shouldn't depend on //device.
   # This is the an exception.
   "+device/udev_linux",  # For udev utility and wrapper library.
 
   # Explicitly disallow using SyncMessageFilter to prevent browser from
   # sending synchronous IPC messages on non-UI threads.
   "-ipc/ipc_sync_message_filter.h",
@@ skipping 96 matching lines @@
     "+content/browser/power_save_blocker_impl.h",
     "+content/public/browser/power_save_blocker.h",
 
     # These dependencies need to be removed.
     "!content/browser/android/content_view_core_impl.h",
     "!content/browser/web_contents/web_contents_impl.h",
     "!content/public/browser/android/content_view_core.h",
     "!content/public/browser/web_contents_observer.h",
   ]
 }