Adding a Confirmation dialog for It2Me on Windows

remoting/host/it2me/BUILD.gn

Index: remoting/host/it2me/BUILD.gn
diff --git a/remoting/host/it2me/BUILD.gn b/remoting/host/it2me/BUILD.gn
index 8b0e89f33b061359e009e354160286f27d41dcb4..a7771cf2901334740eba868b0c300466d43292b5 100644
--- a/remoting/host/it2me/BUILD.gn
+++ b/remoting/host/it2me/BUILD.gn
@@ -19,9 +19,12 @@ source_set("common") {
   sources = [
     "it2me_confirmation_dialog.cc",
     "it2me_confirmation_dialog.h",
-    "it2me_confirmation_dialog_chromeos.cc",
+    "it2me_confirmation_dialog_android.cc",
+    "it2me_confirmation_dialog_linux.cc",
+    "it2me_confirmation_dialog_mac.cc",
     "it2me_confirmation_dialog_proxy.cc",
     "it2me_confirmation_dialog_proxy.h",
+    "it2me_confirmation_dialog_win.cc",
     "it2me_host.cc",
     "it2me_host.h",
     "it2me_native_messaging_host.cc",
@@ -35,6 +38,12 @@ source_set("common") {
     ]
   }
 
+  if (is_chromeos) {
+    sources += [ "it2me_confirmation_dialog_chromeos.cc" ]
+
+    sources -= [ "it2me_confirmation_dialog_linux.cc" ]
+  }
+
   configs += [
     "//build/config/compiler:wexit_time_destructors",
     "//remoting/build/config:version",