Reapply the non-MathExtras parts of

Source/platform/geometry/DoubleSize.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DoubleSize_h
 #define DoubleSize_h
 
 #include "platform/geometry/FloatSize.h"
 #include "platform/geometry/IntSize.h"
 #include "wtf/MathExtras.h"
@@ skipping 42 matching lines @@
     return a.width() == b.width() && a.height() == b.height();
 }
 
 inline bool operator!=(const DoubleSize& a, const DoubleSize& b)
 {
     return a.width() != b.width() || a.height() != b.height();
 }
 
 inline IntSize flooredIntSize(const DoubleSize& p)
 {
-    return IntSize(clampToInteger(floor(p.width())), clampToInteger(floor(p.height())));
+    return IntSize(clampTo<int>(floor(p.width())), clampTo<int>(floor(p.height())));
 }
 
 inline FloatSize toFloatSize(const DoubleSize& p)
 {
     return FloatSize(p.width(), p.height());
 }
 
 } // namespace blink
 
 #endif // DoubleSize_h