Automatically call OnNativeThemeChanged when a widget is added to a hierarchy

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index c46ddd24b6d8b7bc5236e7e5fd83758772cb13ed..00492d2dd354709f6b5fb9e9e5b12e429279c59c 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -849,12 +849,6 @@ void Textfield::OnEnabledChanged() {
   SchedulePaint();
 }
 
-void Textfield::ViewHierarchyChanged(
-    const ViewHierarchyChangedDetails& details) {
-  if (details.is_add && details.child == this)
-    UpdateColorsFromTheme(GetNativeTheme());
-}
-
 void Textfield::OnPaint(gfx::Canvas* canvas) {
   OnPaintBackground(canvas);
   PaintTextAndCursor(canvas);
@@ -901,7 +895,15 @@ gfx::Point Textfield::GetKeyboardContextMenuLocation() {
 }
 
 void Textfield::OnNativeThemeChanged(const ui::NativeTheme* theme) {
-  UpdateColorsFromTheme(theme);
+  gfx::RenderText* render_text = GetRenderText();
+  render_text->SetColor(GetTextColor());
+  UpdateBackgroundColor();
+  render_text->set_cursor_color(GetTextColor());
+  render_text->set_selection_color(theme->GetSystemColor(
+      ui::NativeTheme::kColorId_TextfieldSelectionColor));
+  render_text->set_selection_background_focused_color(theme->GetSystemColor(
+      ui::NativeTheme::kColorId_TextfieldSelectionBackgroundFocused));
+
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -1467,17 +1469,6 @@ void Textfield::UpdateBackgroundColor() {
   SchedulePaint();
 }
 
-void Textfield::UpdateColorsFromTheme(const ui::NativeTheme* theme) {
-  gfx::RenderText* render_text = GetRenderText();
-  render_text->SetColor(GetTextColor());
-  UpdateBackgroundColor();
-  render_text->set_cursor_color(GetTextColor());
-  render_text->set_selection_color(theme->GetSystemColor(
-      ui::NativeTheme::kColorId_TextfieldSelectionColor));
-  render_text->set_selection_background_focused_color(theme->GetSystemColor(
-      ui::NativeTheme::kColorId_TextfieldSelectionBackgroundFocused));
-}
-
 void Textfield::UpdateAfterChange(bool text_changed, bool cursor_changed) {
   if (text_changed) {
     if (controller_)