Make direct calls to _nativeIndexedGetter in "get last" "get first" "get single" instead of calling…

1. Make direct calls to _nativeIndexedGetter in "get last" "get first" "get single" instead of calling the "[]" operator. This avoids one additional native call to the length method for each call to "last" "first" or "single"

2. Fix templateloader to deal with nested 'if' conditions

R=vsm@google.com

Committed: https://code.google.com/p/dart/source/detail?r=27270

[vsm, 2013-09-05 00:00:14]

lgtm, but can you also run go.sh in dart/tools/dom/scripts and ensure the
generated file changes are as expected?

[siva, 2013-09-05 01:01:05]

On 2013/09/05 00:00:14, vsm wrote:
> lgtm, but can you also run go.sh in dart/tools/dom/scripts and ensure the
> generated file changes are as expected?

I have built dartium with these changes and run all the tests (debug and release
mode).

I will run the command you have specified also to ensure the generated files
look ok.

[siva, 2013-09-06 23:09:14]

PTAL
(added generated files to the CL and fixed templateloader for nested if
conditions).

[vsm, 2013-09-06 23:10:04]

lgtm

[siva, 2013-09-06 23:22:36]

Committed patchset #2 manually as r27270 (presubmit successful).