Add git-core build dependency in preparation for merging cros.DEPS to DEPS

BUG=109475
TEST=maual: uninstalled git, run install-buid-deps.sh and gclient sync still works with cros.DEPS

Review URL: http://codereview.chromium.org/9348120

git-svn-id: http://src.chromium.org/svn/trunk/src/build@122185 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

install-build-deps.sh

@@ -62,7 +62,7 @@ dev_list="apache2.2-bin bison curl elfutils fakeroot flex g++ gperf
           libxss-dev libxt-dev libxtst-dev mesa-common-dev msttcorefonts patch
           perl php5-cgi pkg-config python python-cherrypy3 python-dev
           python-psutil rpm ruby subversion ttf-dejavu-core ttf-indic-fonts
-          ttf-kochi-gothic ttf-kochi-mincho ttf-thai-tlwg wdiff
+          ttf-kochi-gothic ttf-kochi-mincho ttf-thai-tlwg wdiff git-core
           $chromeos_dev_list"
 
 # Run-time libraries required by chromeos only