Reland: Introduce the devices Mojo app

device/usb/BUILD.gn

Index: device/usb/BUILD.gn
diff --git a/device/usb/BUILD.gn b/device/usb/BUILD.gn
index ea0248a464855b4c5f02eb2cf19756a4e6adcc06..aa74a10638df3019d48935907bfacfb732442a57 100644
--- a/device/usb/BUILD.gn
+++ b/device/usb/BUILD.gn
@@ -9,12 +9,6 @@ generated_ids = "$target_gen_dir/usb_ids_gen.cc"
 
 source_set("usb") {
   sources = [
-    "device_impl.cc",
-    "device_impl.h",
-    "device_manager_impl.cc",
-    "device_manager_impl.h",
-    "type_converters.cc",
-    "type_converters.h",
     "usb_context.cc",
     "usb_context.h",
     "usb_descriptors.cc",
@@ -45,17 +39,8 @@ source_set("usb") {
     "//base/third_party/dynamic_annotations",
     "//components/device_event_log",
     "//device/core",
-    "//device/usb/public/cpp",
-    "//mojo/environment:chromium",
     "//net",
     "//third_party/libusb",
-    "//third_party/mojo/src/mojo/edk/system",
-  ]
-
-  public_deps = [
-    "//device/usb/public/interfaces",
-    "//third_party/mojo/src/mojo/public/cpp/bindings",
-    "//third_party/mojo/src/mojo/public/cpp/bindings:callback",
   ]
 
   if (is_linux) {