Initialize buffer in FileStreamTest.AsyncWriteError

In the code added in crrev.com/223192 the buffer passed to write is not
initialized which causes valgrind warnings.

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Review URL: https://codereview.chromium.org/23587022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@223257 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/base/file_stream_unittest.cc b/net/base/file_stream_unittest.cc
index 41f1656..c76f3d9 100644
--- a/net/base/file_stream_unittest.cc
+++ b/net/base/file_stream_unittest.cc
@@ -1136,6 +1136,8 @@
       new FileStream(file, flags, NULL, base::MessageLoopProxy::current()));
 
   scoped_refptr<IOBuffer> buf = new IOBuffer(1);
+  buf->data()[0] = 0;
+
   TestCompletionCallback callback;
   int rv = stream->Write(buf.get(), 1, callback.callback());
   if (rv == ERR_IO_PENDING)