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* Install URL protocol handler for chrome-extension:// and chrome-extension-resource://
* Allow extension urls to be handled.
* Register extensions with IO thread extension InfoMap.
* Bonus: app_shell no longer crashes on startup.

With this change an extension background page can print "Hello world" using console.log().

BUG=288226,332982
TEST=browser_tests. Also run app_shell --app=/path/to/extension with an extension with background.js. The JavaScript executes and console.log() works.

Review URL: https://codereview.chromium.org/136453005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245325 0039d316-1c4b-4281-b951-d872f2087c98