Second wave of Win64 warning cleanup

https://codereview.chromium.org/27343002/



git-svn-id: http://skia.googlecode.com/svn/trunk@11778 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/SkNinePatch.cpp b/src/utils/SkNinePatch.cpp
index 9dc8bd2..4e0d1d1 100644
--- a/src/utils/SkNinePatch.cpp
+++ b/src/utils/SkNinePatch.cpp
@@ -43,7 +43,7 @@
         }
         n += 1;
     }
-    return indices - startIndices;
+    return static_cast<int>(indices - startIndices);
 }
 
 // Computes the delta between vertices along a single axis