Change mojo enums to be scoped enums in the generated C++ bindings.

components/arc/test/fake_app_instance.h

Index: components/arc/test/fake_app_instance.h
diff --git a/components/arc/test/fake_app_instance.h b/components/arc/test/fake_app_instance.h
index 509c4513997d243d5f88f11b4d731bd70d91bb2a..a078ea79aad5611b2551e08fad7c75eedf0bf5c3 100644
--- a/components/arc/test/fake_app_instance.h
+++ b/components/arc/test/fake_app_instance.h
@@ -43,7 +43,8 @@ class FakeAppInstance : public AppInstance {
     IconRequest(const std::string& package,
                 const std::string& activity,
                 ScaleFactor scale_factor)
-        : Request(package, activity), scale_factor_(scale_factor) {}
+        : Request(package, activity),
+          scale_factor_(static_cast<int>(scale_factor)) {}
     ~IconRequest() {}
 
     int scale_factor() const { return scale_factor_; }