Henrik Kjellander 44d5d7ba42 Autoroll: Update checkout before reading chromium_revision.
Ensure the checkout is updated _before_ reading the current
revision from the DEPS file. This will avoid errors when a checkout
is not up to date, as updating happened after reading the revision
before this change.

BUG=webrtc:4688
R=phoglund@webrtc.org

Review URL: https://codereview.webrtc.org/1361923004 .

Cr-Commit-Position: refs/heads/master@{#10071}
2015-09-25 11:21:55 +00:00
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