Set the executable bit on the rebaseline tool so it  can be run from linux/mac.
Set the executable bit on the rebaseline tool so it 
can be run from linux/mac.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/147093

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@19161 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