Reduce the number of CachedUAStyles

Source/core/rendering/RenderTheme.h

Index: Source/core/rendering/RenderTheme.h
diff --git a/Source/core/rendering/RenderTheme.h b/Source/core/rendering/RenderTheme.h
index a3ec3f66fed625cdb9eda8407b8b0675a0cc0a37..eb8987632796675609c4cb2f21649ee781912e95 100644
--- a/Source/core/rendering/RenderTheme.h
+++ b/Source/core/rendering/RenderTheme.h
@@ -65,7 +65,7 @@ public:
     // metrics and defaults given the contents of the style.  This includes sophisticated operations like
     // selection of control size based off the font, the disabling of appearance when certain other properties like
     // "border" are set, or if the appearance is not supported by the theme.
-    void adjustStyle(RenderStyle*, Element*,  const CachedUAStyle&);
+    void adjustStyle(RenderStyle*, Element*, const CachedUAStyle*);
 
     // This method is called to paint the widget as a background of the RenderObject.  A widget's foreground, e.g., the
     // text of a button, is always rendered by the engine itself.  The boolean return value indicates
@@ -97,7 +97,7 @@ public:
     virtual bool controlSupportsTints(const RenderObject*) const { return false; }
 
     // Whether or not the control has been styled enough by the author to disable the native appearance.
-    virtual bool isControlStyled(const RenderStyle*, const CachedUAStyle&) const;
+    virtual bool isControlStyled(const RenderStyle*, const CachedUAStyle*) const;
 
     // A general method asking if any control tinting is supported at all.
     virtual bool supportsControlTints() const { return false; }