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Delay the calls to CheckForExternalUpdates() and GarbageCollectExtensions() until onload fires for the first frame to reduce IO at startup.

For newly created profiles we don't delay CheckForExternalUpdates().

BUG=136623
TEST=All unit tests should pass, external extension updates should continue to work.


Review URL: https://chromiumcodereview.appspot.com/10914076

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170960 0039d316-1c4b-4281-b951-d872f2087c98