Protect against receiving different BINDSTATUS_MIMETYPEAVAILABLE multiple times. 
Protect against receiving different BINDSTATUS_MIMETYPEAVAILABLE multiple times. 

Review URL: http://codereview.chromium.org/3038049

git-svn-id: http://src.chromium.org/svn/trunk/src@54979 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a4174da928401fbf7f7f52c9937602cc5a79ce16
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