Revert 222257 "Revert 222235 ""Redirecting URLs to Packaged Apps..."

Revert 222257 "Revert 222235 ""Redirecting URLs to Packaged Apps..."

Reason for revert: The first revert didn't actually fix the issues with the Chrome Frame net test failures, so I'm putting the patch back in.

> Revert 222235 ""Redirecting URLs to Packaged Apps" implementatio..."
> 
> > "Redirecting URLs to Packaged Apps" implementation: revised
> > 
> > Design proposal: https://docs.google.com/document/d/1r-RoOv2URfZBYrT_B6notQ6MeMqZRd1EP1AITuzJCAc/edit?usp=sharing
> > 
> > * Support for url_handlers in manifest
> > * New kind of onLaunched event with navigation info in launch data
> > * Intercept/redirect top-level browser-initiated navigations (bookmarks, omnibox, etc.)
> > * Intercept/redirect top-frame navigations in tabs and app windows. 
> > 
> > This is a rework of https://codereview.chromium.org/22944002/.
> > 
> > BUG=111422
> > 
> > Review URL: https://chromiumcodereview.appspot.com/23847004
> 
> Reason for revert:
> This is the most likely cause of the chrome_frame_net_tests failures (various tests), since no other changes in the blamelist were touching URLRequest bits.
> 
> First failure here: http://build.chromium.org/p/chromium.win/builders/Chrome%20Frame%20Tests%20%28ie6%29/builds/46826
> 
> TBR=sergeygs@chromium.org
> 
> Review URL: https://codereview.chromium.org/23600025

TBR=stevet@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=222258

[SteveT, 2013-09-10 15:32:02]

Committed patchset #1 manually as r222258.