Reapply the non-MathExtras parts of

Source/platform/transforms/PerspectiveTransformOperation.cpp

Index: Source/platform/transforms/PerspectiveTransformOperation.cpp
diff --git a/Source/platform/transforms/PerspectiveTransformOperation.cpp b/Source/platform/transforms/PerspectiveTransformOperation.cpp
index 8ad426556065089cc7c4c6ef454d6831697af044..7149758afea29c686ca9dc1de2912bf2f34644bf 100644
--- a/Source/platform/transforms/PerspectiveTransformOperation.cpp
+++ b/Source/platform/transforms/PerspectiveTransformOperation.cpp
@@ -38,7 +38,7 @@ PassRefPtr<TransformOperation> PerspectiveTransformOperation::blend(const Transf
 
     if (blendToIdentity) {
         double p = blink::blend(m_p, 1., progress); // FIXME: this seems wrong. https://bugs.webkit.org/show_bug.cgi?id=52700
-        return PerspectiveTransformOperation::create(clampToPositiveInteger(p));
+        return PerspectiveTransformOperation::create(clampTo<int>(p, 0));
     }
 
     const PerspectiveTransformOperation* fromOp = static_cast<const PerspectiveTransformOperation*>(from);
@@ -53,7 +53,7 @@ PassRefPtr<TransformOperation> PerspectiveTransformOperation::blend(const Transf
 
     if (decomp.perspectiveZ) {
         double val = -1.0 / decomp.perspectiveZ;
-        return PerspectiveTransformOperation::create(clampToPositiveInteger(val));
+        return PerspectiveTransformOperation::create(clampTo<int>(val, 0));
     }
     return PerspectiveTransformOperation::create(0);
 }