Consume Mojo services directly in Blink's WebUSB implementation.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 2f10531fb0b052a0107f51e681b18e608c35ee29..e6c1a08c0ee021b521ff8d20bc5b26bb3383c1e1 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -122,7 +122,6 @@
 #include "content/renderer/shared_worker_repository.h"
 #include "content/renderer/skia_benchmarking_extension.h"
 #include "content/renderer/stats_collection_controller.h"
-#include "content/renderer/usb/web_usb_client_impl.h"
 #include "content/renderer/wake_lock/wake_lock_dispatcher.h"
 #include "content/renderer/web_frame_utils.h"
 #include "content/renderer/web_ui_extension.h"
@@ -157,7 +156,6 @@
 #include "third_party/WebKit/public/platform/WebURLError.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
-#include "third_party/WebKit/public/platform/modules/webusb/WebUSBClient.h"
 #include "third_party/WebKit/public/web/WebColorSuggestion.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFindOptions.h"
@@ -4289,13 +4287,6 @@ blink::WebBluetooth* RenderFrameImpl::bluetooth() {
   return bluetooth_.get();
 }
 
-blink::WebUSBClient* RenderFrameImpl::usbClient() {
-  if (!usb_client_)
-    usb_client_.reset(new WebUSBClientImpl(GetServiceRegistry()));
-
-  return usb_client_.get();
-}
-
 #if defined(ENABLE_WEBVR)
 blink::WebVRClient* RenderFrameImpl::webVRClient() {
   if (!vr_dispatcher_)