Make Stephen Chenney (schenney@chromium.org) a Source/web OWNER
Make Stephen Chenney (schenney@chromium.org) a Source/web OWNER

Stephen has been giving good feedback for Source/web [1] and has
experience with non-trivial patches in this directory [2]. I
think he would make an excellent OWNER for this directory.

[1] https://codereview.chromium.org/846033002/#msg8
[2] https://codereview.chromium.org/99103006

Review URL: https://codereview.chromium.org/849633003

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