Remove //device/devices_app.

This change removes the code to create a Mojo app containing device
services (currently only USB) and instead makes the Mojo bindings for
//device/usb part of that directory.

The Mojo service implementation is still in a separate //device/usb/mojo
target but this will eventually merge into its parent directory as the
Mojo interface becomes the only public interface for //device/usb.

BUG=None

Review URL: https://codereview.chromium.org/1682363002

Cr-Commit-Position: refs/heads/master@{#374778}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 7cfd4d932..cd5004b 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -357,10 +357,8 @@
       "//components/webusb",
       "//content/app/resources",
       "//device/core",
-      "//device/devices_app/public/cpp",
-      "//device/devices_app/public/cpp:factory",
-      "//device/devices_app/usb/public/interfaces",
-      "//device/usb",
+      "//device/usb/mojo",
+      "//device/usb/public/interfaces",
       "//media",
       "//media/midi",
       "//mojo/common",