Prevent mixed content warnings from being displayed when an iframe loads a page and dns resolution fails (which displays chrome: content in the iframe). This does not allow chrome: uris to be loaded in other cases (this is explicitely blocked above the change)
Prevent mixed content warnings from being displayed when an iframe loads a page and dns resolution fails (which displays chrome: content in the iframe).
This does not allow chrome: uris to be loaded in other cases (this is explicitely blocked above the change)

BUG=57198
TEST=N/A
Review URL: http://codereview.chromium.org/7824056

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@100808 0039d316-1c4b-4281-b951-d872f2087c98

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