Clean up a few warnings on Windows x64.



git-svn-id: http://skia.googlecode.com/svn/trunk@10233 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/device/xps/SkXPSDevice.cpp b/src/device/xps/SkXPSDevice.cpp
index bfae6de..30e81bf 100644
--- a/src/device/xps/SkXPSDevice.cpp
+++ b/src/device/xps/SkXPSDevice.cpp
@@ -2245,7 +2245,7 @@
                            SkBitSet& glyphsUsed,
                            SkDraw& myDraw, SkXPSDrawProcs& procs) {
     procs.fD1GProc = xps_draw_1_glyph;
-    int numGlyphGuess;
+    size_t numGlyphGuess;
     switch (paint.getTextEncoding()) {
         case SkPaint::kUTF8_TextEncoding:
             numGlyphGuess = SkUTF8_CountUnichars(