Fix python syntax error in register_host.py introduced by r111427.
Fix python syntax error in register_host.py introduced by r111427.

TBR=maruel@chromium.org
TEST=register_host.py works as expected.

Review URL: http://codereview.chromium.org/8956058

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@115903 0039d316-1c4b-4281-b951-d872f2087c98

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