fix: modernize-use-equals-default warnings (#44935)

fix: use '= default' to define a trivial destructor [modernize-use-equals-default]

shell/common/color_util.h

@@ -12,7 +12,7 @@
 // SkColor is a typedef for uint32_t, this wrapper is to tag an SkColor for
 // ease of use in gin converters.
 struct WrappedSkColor {
-  WrappedSkColor() {}
+  WrappedSkColor() = default;
   WrappedSkColor(SkColor c) : value(c) {}  // NOLINT(runtime/explicit)
   SkColor value;
   operator SkColor() const { return value; }

shell/common/gin_helper/event_emitter.h

@@ -61,7 +61,7 @@ class EventEmitter : public gin_helper::Wrappable<T> {
   EventEmitter& operator=(const EventEmitter&) = delete;
 
  protected:
-  EventEmitter() {}
+  EventEmitter() = default;
 
  private:
   // this.emit(name, event, args...);