Don't request missing favicon on every page request.
Mark Favicon as 'Unable to Download' if server returns HTTP status 404 and
don't try to download it again until user closes the browser or clicks 'Shift-Reload'
(RELOAD_IGNORING_CACHE).
Firefox 20 and IE 10 don't request missing favicon.ico on every page request.
Propagated HTTP Status Code from MultiResolutionImageResourceFetcher all
the way up to FaviconTabHelper, which required extension of 3 interfaces.
BUG=39402
TEST=FaviconHandlerTest.UnableToDownloadFavicon
Reviewers:
sky@chromium.org - Overall CL, chrome/browser/*, content/browser/*
palmer@chromium.org - content/common/image_messages.h
joi@chromium.org - content/public/browser/web_contents.h
jamesr@chromium.org - content/renderer/*, webkit/glue/*
mnaganov@chromium.org - android_webview/browser/icon_helper.*
Review URL: https://chromiumcodereview.appspot.com/14322023
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@200194 0039d316-1c4b-4281-b951-d872f2087c98
24 files changed
