Move UsbService to its own component.

components/usb_service/usb_context_unittest.cc

Index: components/usb_service/usb_context_unittest.cc
diff --git a/chrome/browser/usb/usb_context_unittest.cc b/components/usb_service/usb_context_unittest.cc
similarity index 92%
rename from chrome/browser/usb/usb_context_unittest.cc
rename to components/usb_service/usb_context_unittest.cc
index dce79f43e88c95549a62ee52c5a1393802dfdb60..f2850d4c848c8c7ec12b90f57d957273237572de 100644
--- a/chrome/browser/usb/usb_context_unittest.cc
+++ b/components/usb_service/usb_context_unittest.cc
@@ -2,13 +2,15 @@
 // 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 "base/threading/platform_thread.h"
 #include "build/build_config.h"
+#include "components/usb_service/usb_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/libusb/src/libusb/libusb.h"
 
+using usb_service::UsbContext;
+using usb_service::PlatformUsbContext;
+
 namespace {
 
 class UsbContextTest : public testing::Test {
@@ -17,6 +19,7 @@ class UsbContextTest : public testing::Test {
    public:
     explicit UsbContextForTest(PlatformUsbContext context)
         : UsbContext(context) {}
+
    private:
     virtual ~UsbContextForTest() {}
     DISALLOW_COPY_AND_ASSIGN(UsbContextForTest);