Remove clips where we can show that they are unnecessary.

Source/core/platform/graphics/RoundedRect.h

Index: Source/core/platform/graphics/RoundedRect.h
diff --git a/Source/core/platform/graphics/RoundedRect.h b/Source/core/platform/graphics/RoundedRect.h
index 8dde238afdee6dde41d96c5b9b5a4cb147a3f985..80c84f49c73fd987708cfee6f50302a7cb076f4b 100644
--- a/Source/core/platform/graphics/RoundedRect.h
+++ b/Source/core/platform/graphics/RoundedRect.h
@@ -82,6 +82,9 @@ public:
     bool isRounded() const { return !m_radii.isZero(); }
     bool isEmpty() const { return m_rect.isEmpty(); }
 
+    // Returns a quickly computed rect enclosed by the rounded rect.
+    IntRect radiusCenterRect() const;
+
     void setRect(const IntRect& rect) { m_rect = rect; }
     void setRadii(const Radii& radii) { m_radii = radii; }