Change the metro driver to use the driver from the version directory.
Change the metro driver to use the driver from the version
directory.

So upgrades are less of a PITA

BUG=118641
TEST=chrome starts.
Review URL: https://chromiumcodereview.appspot.com/9963074

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@130297 0039d316-1c4b-4281-b951-d872f2087c98

yitian134/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,ropik/chromium,adobe/chromium,adobe/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,yitian134/chromium