Synchronously update the loading state when a load starts so that the UI will...

Synchronously update the loading state when a load starts so that the UI will
be more responsive and the loading state won't be out-of-sync with anything
else. This also removes the synchronous update to the throbber when we load a
URL because this happens before the loda actually starts, giving a flash of the
default favicon. The load start call made by RenderViewHost will cover this
case after the load actually starts.

BUG=11051
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=14718

[brettw, 2009-04-28 07:05:23]

TBR since this is a stable blocker and I'm in the opposite time zone.

[Ben Goodger (Google), 2009-04-28 17:54:50]

OK.

It'd be interesting to try and construct tests for these different UI load
states and use a mock to determine that for a simulated variety of loads the
state sequences occurred at the right times. The trick is to find a way to
reliably reproduce the connections.