fix size_t/int warnings

include/core/SkReader32.h

Index: include/core/SkReader32.h
diff --git a/include/core/SkReader32.h b/include/core/SkReader32.h
index 40ae12ce23638c05755f5742e0ecaf63f8b22401..7e8038d0ae3a7913cf3c5ee036b866b7720e0963 100644
--- a/include/core/SkReader32.h
+++ b/include/core/SkReader32.h
@@ -33,14 +33,14 @@ public:
         fStop = (const char*)data + size;
     }
 
-    uint32_t size() const { return SkToU32(fStop - fBase); }
-    uint32_t offset() const { return SkToU32(fCurr - fBase); }
+    size_t size() const { return fStop - fBase; }
+    size_t offset() const { return fCurr - fBase; }
     bool eof() const { return fCurr >= fStop; }
     const void* base() const { return fBase; }
     const void* peek() const { return fCurr; }
 
-    uint32_t available() const { return SkToU32(fStop - fCurr); }
-    bool isAvailable(uint32_t size) const { return fCurr + size <= fStop; }
+    size_t available() const { return fStop - fCurr; }
+    bool isAvailable(size_t size) const { return fCurr + size <= fStop; }
 
     void rewind() { fCurr = fBase; }