More Windows 64b compilation warning fixes

https://codereview.chromium.org/47513017/



git-svn-id: http://skia.googlecode.com/svn/trunk@12337 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index 0b15d6a..804dc41 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -123,7 +123,7 @@
     *y = *y - yAdj;
 }
 
-static size_t max_glyphid_for_typeface(SkTypeface* typeface) {
+static int max_glyphid_for_typeface(SkTypeface* typeface) {
     SkAutoResolveDefaultTypeface autoResolve(typeface);
     typeface = autoResolve.get();
     return typeface->countGlyphs() - 1;