Fix setFileOffset type to remove warnings.

Review URL: https://codereview.appspot.com/6334050

git-svn-id: http://skia.googlecode.com/svn/trunk@4585 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/pdf/SkPDFPage.cpp b/src/pdf/SkPDFPage.cpp
index 3c8bd04..3f3dec9 100644
--- a/src/pdf/SkPDFPage.cpp
+++ b/src/pdf/SkPDFPage.cpp
@@ -37,7 +37,7 @@
 
 off_t SkPDFPage::getPageSize(SkPDFCatalog* catalog, off_t fileOffset) {
     SkASSERT(fContentStream.get() != NULL);
-    catalog->setFileOffset(fContentStream.get(), (size_t) fileOffset);
+    catalog->setFileOffset(fContentStream.get(), fileOffset);
     return fContentStream->getOutputSize(catalog, true);
 }