Assert the return value of sock_->Write() for both sync and async completions.
Assert the return value of sock_->Write() for both sync and async
completions.

R=rvargas@chromium.org
BUG=none
TEST=the tests in question still pass.

Review URL: http://codereview.chromium.org/7231003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@89988 0039d316-1c4b-4281-b951-d872f2087c98

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