Use a proper closure instead of a 'close your eyes' style closure

Use a proper closure instead of a 'close your eyes' style closure
for setting up '_printClosure'.

This avoid the startup cost of looking up types 'window', 'console'
and 'HTMLDocument' types when we try to setup _printClosure.
On a nexus 4 device the change results in the following time changes:

Before the change:
I/Dartium (25903):     createIsolate before printClosure setting 155.318 ms
I/Dartium (25903):     createIsolate after printClosure setting 403.052 ms


After the Change:
I/Dartium (26537):     createIsolate before printClosure setting 157.058 ms
I/Dartium (26537):     createIsolate after printClosure setting 162.918 ms

R=rmacnak@google.com, vsm@google.com

Committed: https://code.google.com/p/dart/source/detail?r=36943

[vsm, 2014-06-03 19:12:21]

lgtm!

Nice - I think we're still looking up HTMLDocument though.  I believe we're
creating a persistent handle to it as part of startup.

[siva, 2014-06-03 20:00:02]

Yes, I will look at the persistent handle creation for HTMLDocument to see if
that is still required.

[rmacnak, 2014-06-03 20:00:32]

lgtm

[siva, 2014-06-03 21:09:13]

Committed patchset #1 manually as r36943 (presubmit successful).