Flesh out URLLoader's download_to_file function.
* tie the lifetime of the resulting temp file to the lifetime of the URLLoader
(the plan is to later extend the lifetime of the temp file to support xhr.responseBlob)
* make it work in test_shell
* make it work for sync requests
* added OnDataDownloaded messages to report progress
A related BlobURL loading change.
* grab a reference to the blob early on to ensure it's still there when the 'job' is finally started.
TEST=manual and deletable_file_reference_unittest.cc
BUG=52486,56752
Review URL: http://codereview.chromium.org/3396029
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@60862 0039d316-1c4b-4281-b951-d872f2087c98
21 files changed
