Force compiler to deduce src type for checked_cast<dst, src>.

third_party/base/stl_util.h

Index: third_party/base/stl_util.h
diff --git a/third_party/base/stl_util.h b/third_party/base/stl_util.h
index 0bf442c316c6ae71cb8ddf574d0c02d315f8a82b..795414b59f021543e904394efcd693985bf3b392 100644
--- a/third_party/base/stl_util.h
+++ b/third_party/base/stl_util.h
@@ -41,7 +41,7 @@ class FakeUniquePtr : public std::unique_ptr<T> {
 // size_t size() method return values will be checked.
 template <typename ResultType, typename Collection>
 ResultType CollectionSize(const Collection& collection) {
-  return pdfium::base::checked_cast<ResultType, size_t>(collection.size());
+  return pdfium::base::checked_cast<ResultType>(collection.size());
 }
 
 // Track the addition of an object to a set, removing it automatically when