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Previously we would extract all necessary files every time we ran the
app. This is obviously unnecessary for any bundled apps. Now we
extract only as necessary.

R=ben@chromium.org, jcivelli@chromium.org
BUG=none
TEST=none

Review URL: https://codereview.chromium.org/1149813002

Cr-Commit-Position: refs/heads/master@{#330824}