Update from https://crrev.com/315085

net/base/file_stream_unittest.cc

Index: net/base/file_stream_unittest.cc
diff --git a/net/base/file_stream_unittest.cc b/net/base/file_stream_unittest.cc
index fc9257e5d1c0af8d6f541191f02415862cc57da3..8b47eccf4144185da0a990c7f60a85fa848b7080 100644
--- a/net/base/file_stream_unittest.cc
+++ b/net/base/file_stream_unittest.cc
@@ -546,6 +546,25 @@ class TestWriteReadCompletionCallback {
 
   const CompletionCallback& callback() const { return callback_; }
 
+  void ValidateWrittenData() {
+    TestCompletionCallback callback;
+    int rv = 0;
+    for (;;) {
+      scoped_refptr<IOBufferWithSize> buf = new IOBufferWithSize(4);
+      rv = stream_->Read(buf.get(), buf->size(), callback.callback());
+      if (rv == ERR_IO_PENDING) {
+        base::MessageLoop::ScopedNestableTaskAllower allow(
+            base::MessageLoop::current());
+        rv = callback.WaitForResult();
+      }
+      EXPECT_LE(0, rv);
+      if (rv <= 0)
+        break;
+      *total_bytes_read_ += rv;
+      data_read_->append(buf->data(), rv);
+    }
+  }
+
  private:
   void OnComplete(int result) {
     DCHECK_LT(0, result);
@@ -577,22 +596,6 @@ class TestWriteReadCompletionCallback {
             base::MessageLoop::current());
         EXPECT_LE(0, callback64.WaitForResult());
       }
-
-      TestCompletionCallback callback;
-      for (;;) {
-        scoped_refptr<IOBufferWithSize> buf = new IOBufferWithSize(4);
-        rv = stream_->Read(buf.get(), buf->size(), callback.callback());
-        if (rv == ERR_IO_PENDING) {
-          base::MessageLoop::ScopedNestableTaskAllower allow(
-              base::MessageLoop::current());
-          rv = callback.WaitForResult();
-        }
-        EXPECT_LE(0, rv);
-        if (rv <= 0)
-          break;
-        *total_bytes_read_ += rv;
-        data_read_->append(buf->data(), rv);
-      }
     }
 
     result_ = *total_bytes_written_;
@@ -646,6 +649,8 @@ TEST_F(FileStreamTest, WriteRead) {
   EXPECT_LT(0, rv);
   EXPECT_EQ(kTestDataSize, total_bytes_written);
 
+  callback.ValidateWrittenData();
+
   stream.reset();
 
   EXPECT_TRUE(base::GetFileSize(temp_file_path(), &file_size));