Fix silent truncations when extracting values from CheckedNumeric

chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader_unittest.cc

Index: chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader_unittest.cc
diff --git a/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader_unittest.cc b/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader_unittest.cc
index 2a2f2f733ff14cb876aa9592dcc0682be13281f9..09fcf7715bf1f94767d64753e0e9841318876f23 100644
--- a/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader_unittest.cc
+++ b/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader_unittest.cc
@@ -132,7 +132,7 @@ TEST_F(FileSystemProviderFileStreamReader, Read_AllAtOnce) {
   FileStreamReader reader(NULL, file_url_, initial_offset,
                           *fake_file_->metadata->modification_time);
   scoped_refptr<net::IOBuffer> io_buffer(new net::IOBuffer(
-      base::CheckedNumeric<size_t>(*fake_file_->metadata->size).ValueOrDie()));
+      base::checked_cast<size_t>(*fake_file_->metadata->size)));
 
   const int result =
       reader.Read(io_buffer.get(), *fake_file_->metadata->size,
@@ -155,7 +155,7 @@ TEST_F(FileSystemProviderFileStreamReader, Read_WrongFile) {
   FileStreamReader reader(NULL, wrong_file_url_, initial_offset,
                           *fake_file_->metadata->modification_time);
   scoped_refptr<net::IOBuffer> io_buffer(new net::IOBuffer(
-      base::CheckedNumeric<size_t>(*fake_file_->metadata->size).ValueOrDie()));
+      base::checked_cast<size_t>(*fake_file_->metadata->size)));
 
   const int result =
       reader.Read(io_buffer.get(), *fake_file_->metadata->size,
@@ -250,7 +250,7 @@ TEST_F(FileSystemProviderFileStreamReader, Read_ModifiedFile) {
   FileStreamReader reader(NULL, file_url_, initial_offset, base::Time::Max());
 
   scoped_refptr<net::IOBuffer> io_buffer(new net::IOBuffer(
-      base::CheckedNumeric<size_t>(*fake_file_->metadata->size).ValueOrDie()));
+      base::checked_cast<size_t>(*fake_file_->metadata->size)));
   const int result =
       reader.Read(io_buffer.get(), *fake_file_->metadata->size,
                   base::Bind(&EventLogger::OnRead, logger.GetWeakPtr()));
@@ -269,7 +269,7 @@ TEST_F(FileSystemProviderFileStreamReader, Read_ExpectedModificationTimeNull) {
   FileStreamReader reader(NULL, file_url_, initial_offset, base::Time());
 
   scoped_refptr<net::IOBuffer> io_buffer(new net::IOBuffer(
-      base::CheckedNumeric<size_t>(*fake_file_->metadata->size).ValueOrDie()));
+      base::checked_cast<size_t>(*fake_file_->metadata->size)));
   const int result =
       reader.Read(io_buffer.get(), *fake_file_->metadata->size,
                   base::Bind(&EventLogger::OnRead, logger.GetWeakPtr()));