Move UsbService to its own component.

components/usb_service/usb_context.cc

Index: components/usb_service/usb_context.cc
diff --git a/chrome/browser/usb/usb_context.cc b/components/usb_service/usb_context.cc
similarity index 95%
rename from chrome/browser/usb/usb_context.cc
rename to components/usb_service/usb_context.cc
index 27971e4e499156da8f114c633fb7146a37333982..723178788f2341a1da85d7466d01f89202a22fb7 100644
--- a/chrome/browser/usb/usb_context.cc
+++ b/components/usb_service/usb_context.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/usb/usb_context.h"
+#include "components/usb_service/usb_context.h"
 
 #include "base/logging.h"
 #include "base/synchronization/waitable_event.h"
@@ -10,6 +10,8 @@
 #include "third_party/libusb/src/libusb/interrupt.h"
 #include "third_party/libusb/src/libusb/libusb.h"
 
+namespace usb_service {
+
 // The UsbEventHandler works around a design flaw in the libusb interface. There
 // is currently no way to signal to libusb that any caller into one of the event
 // handler calls should return without handling any events.
@@ -71,3 +73,5 @@ UsbContext::~UsbContext() {
   event_handler_ = NULL;
   libusb_exit(context_);
 }
+
+}  // namespace usb_service