Add a default constructor to the MockRead struct so that we can do things like dynamically create an array of them.
Add a default constructor to the MockRead struct so
that we can do things like dynamically create an array
of them.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/434039

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@32951 0039d316-1c4b-4281-b951-d872f2087c98

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