Implemented stub ShareService mojo service, for navigator.share.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 75654d2822d81030745104737bd04d316b615cdb..cc740dad338149a207b9b493f652d5b923b7128e 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -54,6 +54,7 @@
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/shared_worker/shared_worker_service_impl.h"
+#include "content/browser/webshare/share_service_impl.h"
 #include "content/browser/websockets/websocket_manager.h"
 #include "content/browser/webui/web_ui_controller_factory_registry.h"
 #include "content/common/accessibility_messages.h"
@@ -2293,6 +2294,8 @@ void RenderFrameHostImpl::RegisterMojoInterfaces() {
 
   GetContentClient()->browser()->RegisterRenderFrameMojoInterfaces(
       GetInterfaceRegistry(), this);
+
+  GetInterfaceRegistry()->AddInterface(base::Bind(&ShareServiceImpl::Create));
 }
 
 void RenderFrameHostImpl::ResetWaitingState() {