Miscellaneous cleanup to reduce number of includes in platform/graphics/

Source/core/platform/graphics/FloatPoint.h

Index: Source/core/platform/graphics/FloatPoint.h
diff --git a/Source/core/platform/graphics/FloatPoint.h b/Source/core/platform/graphics/FloatPoint.h
index 1574deb38fef6e833545818bfc62bdd2ebbc7435..8b399c2bea25fee9fcbc1b816b9ae81e714a6ffb 100644
--- a/Source/core/platform/graphics/FloatPoint.h
+++ b/Source/core/platform/graphics/FloatPoint.h
@@ -29,7 +29,6 @@
 
 #include "core/platform/graphics/FloatSize.h"
 #include "core/platform/graphics/IntPoint.h"
-#include "wtf/MathExtras.h"
 
 #if OS(DARWIN)
 typedef struct CGPoint CGPoint;
@@ -209,10 +208,7 @@ inline float operator*(const FloatPoint& a, const FloatPoint& b)
     return a.dot(b);
 }
 
-inline IntPoint roundedIntPoint(const FloatPoint& p)
-{
-    return IntPoint(clampToInteger(roundf(p.x())), clampToInteger(roundf(p.y())));
-}
+IntPoint roundedIntPoint(const FloatPoint&);
 
 inline IntPoint flooredIntPoint(const FloatPoint& p)
 {