views: Add OnEnabledChanged() method to View class.

views/controls/native_control.cc

Index: views/controls/native_control.cc
diff --git a/views/controls/native_control.cc b/views/controls/native_control.cc
index 83a67e53a0eb24418b26ab629b3198991e303514..1543da082da63bbeba694e740bef7e9de515942b 100644
--- a/views/controls/native_control.cc
+++ b/views/controls/native_control.cc
@@ -312,13 +312,10 @@ void NativeControl::SetVisible(bool f) {
   }
 }
 
-void NativeControl::SetEnabled(bool enabled) {
-  if (enabled_ != enabled) {
-    View::SetEnabled(enabled);
-    if (GetNativeControlHWND()) {
-      EnableWindow(GetNativeControlHWND(), enabled_);
-    }
-  }
+void NativeControl::OnEnabledChanged() {
+  View::OnEnabledChanged();
+  if (GetNativeControlHWND())
+    EnableWindow(GetNativeControlHWND(), View::IsEnabled());
 }
 
 void NativeControl::OnPaint(gfx::Canvas* canvas) {