chromeos: Update libcros dep to 7537f1e8.
chromeos: Update libcros dep to 7537f1e8.

TEST=built and ran chrome; checked that it was interacting with libcros
BUG=chromium-os:4816

Review URL: http://codereview.chromium.org/5603012

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@68661 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser