Reapply the non-MathExtras parts of

Source/platform/LayoutUnit.h

Index: Source/platform/LayoutUnit.h
diff --git a/Source/platform/LayoutUnit.h b/Source/platform/LayoutUnit.h
index 56e284ba033cb20449cb7a9b2affa7439f44e2f4..c78ed541704764d267a87137a4dae52f6101dfc8 100644
--- a/Source/platform/LayoutUnit.h
+++ b/Source/platform/LayoutUnit.h
@@ -74,14 +74,14 @@ public:
     static LayoutUnit fromFloatCeil(float value)
     {
         LayoutUnit v;
-        v.m_value = clampToInteger(ceilf(value * kFixedPointDenominator));
+        v.m_value = clampTo<int>(ceilf(value * kFixedPointDenominator));
         return v;
     }
 
     static LayoutUnit fromFloatFloor(float value)
     {
         LayoutUnit v;
-        v.m_value = clampToInteger(floorf(value * kFixedPointDenominator));
+        v.m_value = clampTo<int>(floorf(value * kFixedPointDenominator));
         return v;
     }