GTTF: Mark ExtensionProxyUITest.GetProperty as FLAKY.
GTTF: Mark ExtensionProxyUITest.GetProperty as FLAKY.

TBR=kkania

BUG=59440
TEST=ui_tests

Review URL: http://codereview.chromium.org/3792010

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@62852 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