Download code cleanup: split big files into smaller one.
It's hard to find things in the download directory. DownloadFile and DownloadFileManager
were bundled together. Similarly for DownloadItem and DownloadManager, which was much less
intuitive. Some 3-5 line structs were also in one bag with something else. I extracted them
to their own small file.
TEST=unit_tests, browser_tests, ui_tests
BUG=48913
Review URL: http://codereview.chromium.org/2806054
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@52749 0039d316-1c4b-4281-b951-d872f2087c98
41 files changed
