Second wave of Win64 warning cleanup

bench/FontCacheBench.cpp

Index: bench/FontCacheBench.cpp
===================================================================
--- bench/FontCacheBench.cpp	(revision 11775)
+++ bench/FontCacheBench.cpp	(working copy)
@@ -20,7 +20,7 @@
     while (*curr != gUniqueGlyphIDs_Sentinel) {
         curr += 1;
     }
-    return curr - start;
+    return static_cast<int>(curr - start);
 }
 
 class FontCacheBench : public SkBenchmark {
@@ -39,7 +39,7 @@
 
         const uint16_t* array = gUniqueGlyphIDs;
         while (*array != gUniqueGlyphIDs_Sentinel) {
-            size_t count = count_glyphs(array);
+            int count = count_glyphs(array);
             for (int i = 0; i < this->getLoops(); ++i) {
                 paint.measureText(array, count * sizeof(uint16_t));
             }