Remove BrowserThread dependency from usb_service.

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 701fab0a53c385e64054bceb846b64cbd043d386..4d2f33400aa7fbb3ef9bc1561a1985fffc092213 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -27,6 +27,7 @@
 #include "chrome/browser/background/background_mode_manager.h"
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/chrome_content_browser_client.h"
+#include "chrome/browser/chrome_device_client.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/component_updater/chrome_component_updater_configurator.h"
 #include "chrome/browser/defaults.h"
@@ -194,6 +195,10 @@ BrowserProcessImpl::BrowserProcessImpl(
   InitIdleMonitor();
 #endif
 
+#if !defined(OS_ANDROID)
+  device_client_.reset(new ChromeDeviceClient);
+#endif
+
 #if defined(ENABLE_EXTENSIONS)
   apps::AppsClient::Set(ChromeAppsClient::GetInstance());