Removing redundant collection methods from DOM collections.

With the collections deriving from ListBase, we no longer need to implement a number of boiler-plate methods.

There are some gotchas with Element and Node lists as they may mutate the list being passed in if it's a nodelist as well, so I'm keeping those unimplemented.

In some cases this may fall back to less efficient operations (such as the WrappedList which no longer forwards every method), but I tried to keep all of the primary cases fast and I believe that these methods would fall back to generic implementations anyways in all cases where we use the classes.

BUG=

Committed: https://code.google.com/p/dart/source/detail?r=21848

[sra1, 2013-04-19 20:51:19]

lgtm

[blois, 2013-04-22 22:29:13]

Committed patchset #1 manually as r21848 (presubmit successful).