Refactor HtmlDefinitions JS emission.

* Build the quoted-key Closure-compatibility exports into the definition
  generators, so that there is no list at the end of the file to forget
  to update.
* Merge duplicate code in the two entry points HtmlDefinitions$Builder
  and HtmlDefinitions.main; the latter now produces output identical to
  the former (it is not used from code, so I assume it is intended for
  debugging).

@r5168

[metaweta, 2012-11-29 19:31:11]

LGTM modulo comments.

https://codereview.appspot.com/6782129/diff/1/src/com/google/caja/lang/html/H...
File src/com/google/caja/lang/html/HtmlDefinitions.java (right):

https://codereview.appspot.com/6782129/diff/1/src/com/google/caja/lang/html/H...
src/com/google/caja/lang/html/HtmlDefinitions.java:482: if
(currentDate.indexOf("*/") >= 0) {
I think this is stale code; the stuff below may originally have been in a /* */
delimited comment.  With a single-line comment, we should test for \n as a
terminator.

https://codereview.appspot.com/6782129/diff/1/src/com/google/caja/lang/html/H...
src/com/google/caja/lang/html/HtmlDefinitions.java:583: // TODO(kpreid): This is
duplicative of Builder.build and looks like it
You said this TODO has been done.