SELECT element: Fix a bug that intrinsic width is too narrow in less-than-100% zoom level.

third_party/WebKit/Source/core/paint/ThemePainterDefault.h

Index: third_party/WebKit/Source/core/paint/ThemePainterDefault.h
diff --git a/third_party/WebKit/Source/core/paint/ThemePainterDefault.h b/third_party/WebKit/Source/core/paint/ThemePainterDefault.h
index 48c21902096a71dd667190e63b3dece215d9b83a..a66dd692bed5d595f71c5fa67acb2d4e023d8e72 100644
--- a/third_party/WebKit/Source/core/paint/ThemePainterDefault.h
+++ b/third_party/WebKit/Source/core/paint/ThemePainterDefault.h
@@ -35,10 +35,11 @@
 namespace blink {
 
 class LayoutBox;
+class LayoutThemeDefault;
 
 class ThemePainterDefault final : public ThemePainter {
  public:
-  ThemePainterDefault();
+  explicit ThemePainterDefault(LayoutThemeDefault&);
 
  private:
   bool paintCheckbox(const LayoutObject&,
@@ -84,6 +85,9 @@ class ThemePainterDefault final : public ThemePainter {
   void setupMenuListArrow(const LayoutBox&,
                           const IntRect&,
                           WebThemeEngine::ExtraParams&);
+
+  // ThemePaintDefault is a part object of m_theme.
+  LayoutThemeDefault& m_theme;
 };
 
 }  // namespace blink