chromeos: Update system_api dep to 58d34158.
chromeos: Update system_api dep to 58d34158.

I'm doing this to pick up a naming change for a not-yet-used
D-Bus signal that'll be sent by the power manager
("PowerButtonEvent" becomes "ButtonEvent").

BUG=98328
TEST=ran "gclient sync"
TBR=satorux@chromium.org

Review URL: http://codereview.chromium.org/8919023

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@114108 0039d316-1c4b-4281-b951-d872f2087c98

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