Relax gallery test download checks so that we can test installing hosted apps from test galleries.
Relax gallery test download checks so that we can test
installing hosted apps from test galleries.

BUG=54408
TEST=Install a hosted app from a test gallery using the --apps-gallery-url command-line flag.

Review URL: http://codereview.chromium.org/3611009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@61660 0039d316-1c4b-4281-b951-d872f2087c98

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