Move UsbService to its own component.

components/usb_service.gypi

Index: components/usb_service.gypi
diff --git a/components/usb_service.gypi b/components/usb_service.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..97f4a618e972daf8429bf79bed10abd2c2be5641
--- /dev/null
+++ b/components/usb_service.gypi
@@ -0,0 +1,35 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'targets': [{
+    'target_name': 'usb_service',
+    'type': '<(component)',
+    'dependencies': [
+      '../base/base.gyp:base',
+      '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
+      '../content/content.gyp:content_browser',
+      '../net/net.gyp:net',
+      '../third_party/libusb/libusb.gyp:libusb',
+    ],
+    'defines': [
+      'USB_SERVICE_IMPLEMENTATION',
+    ],
+    'include_dirs': [
+      '..',
+    ],
+    'sources': [
+      'usb_service/usb_context.cc',
+      'usb_service/usb_context.h',
+      'usb_service/usb_device.cc',
+      'usb_service/usb_device.h',
+      'usb_service/usb_device_handle.cc',
+      'usb_service/usb_device_handle.h',
+      'usb_service/usb_interface.cc',
+      'usb_service/usb_interface.h',
+      'usb_service/usb_service.cc',
+      'usb_service/usb_service.h',
+    ]
+  }],
+}