Type warning fix for: Add string art GM and sample.

R=robertphillips@google.com

Review URL: https://codereview.chromium.org/24258003

git-svn-id: http://skia.googlecode.com/svn/trunk@11384 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleStringArt.cpp b/samplecode/SampleStringArt.cpp
index c6547ed..353d4cc 100644
--- a/samplecode/SampleStringArt.cpp
+++ b/samplecode/SampleStringArt.cpp
@@ -37,7 +37,7 @@
         SkPath path;
         path.moveTo(center);
 
-        while (length < (SkScalarHalf(SkMin32(this->width(), this->height())) - 10.f))
+        while (length < (SkScalarHalf(SkMinScalar(this->width(), this->height())) - 10.f))
         {
             SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
                                        length*SkScalarSin(step) + center.fY);