Read Google Update registry keys first from HKCU then from HKLM to handle system level install case. BUG=1455516.
Read Google Update registry keys first from HKCU then from HKLM to handle system level install case.
BUG=1455516.

Review URL: http://codereview.chromium.org/8974

git-svn-id: http://src.chromium.org/svn/trunk/src@4462 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 0b82da875e54611a027efdf15820e3efa72c6488
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser