Update fling library for changes to DartCompilerListener

Update fling library for changes to DartCompilerListener

http://code.google.com/p/dart/issues/detail?id=1106

Committed: https://code.google.com/p/dart/source/detail?r=3194

[zundel, 2012-01-11 16:59:29]

This is just to update the library to match your recent changes to
DartCompilerListener from abstract class to interface.

[scheglov, 2012-01-11 17:29:07]

http://codereview.chromium.org/9186008/diff/1/client/fling/src/java/core/com/...
File client/fling/src/java/core/com/google/dart/CompileService.java (right):

http://codereview.chromium.org/9186008/diff/1/client/fling/src/java/core/com/...
client/fling/src/java/core/com/google/dart/CompileService.java:127: private
static class Listener  implements DartCompilerListener {
I think extends DartCompilerListener.Empty is better.

http://codereview.chromium.org/9186008/diff/1/client/fling/src/java/core/com/...
client/fling/src/java/core/com/google/dart/CompileService.java:143: public void
unitCompiled(DartUnit unit) {
If you will extend DartCompilerListener.Empty, you can remove this method.

http://codereview.chromium.org/9186008/diff/1/client/fling/src/java/core/com/...
client/fling/src/java/core/com/google/dart/CompileService.java:147: public void
unitAboutToCompile(DartSource arg0, boolean arg1) {
If you will extend DartCompilerListener.Empty, you can remove this method.

http://codereview.chromium.org/9186008/diff/1/client/fling/src/java/core/com/...
client/fling/src/java/core/com/google/dart/CompileService.java:192: new
DartCompilerListener() {
Same here, extend DartCompilerListener.Empty instead and override only onError()
method.

[zundel, 2012-01-11 17:36:04]

updated patch

[scheglov, 2012-01-11 17:36:48]

LGTM